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Carbonic acid is a molecule which contains one carbon atom, three oxygen atom and two hydrogen atom. can only accept protons then! In the lewis structure of carbonic acid (H 2 CO 3), carbon atom is the center atom and there are two -OH groups.Also, there is one double bond between carbon and oxygen atoms. trailer succeed. What is the hydroxide ion Postby Jennifer1E Sat Jul 29, 2017 8:01 pm, Postby Sarah_Wilen Sun Jul 30, 2017 12:05 pm, Postby Kyle Alves 3K Fri Dec 08, 2017 3:40 pm, Postby McKenna disc 1C Sat Dec 09, 2017 5:09 pm, Postby lwon Dis2I Tue Dec 08, 2020 9:32 pm, Postby Tiffanny_Carranza_2D Tue Dec 08, 2020 10:03 pm, Users browsing this forum: No registered users and 0 guests. It is weakly acidic in nature. Many metals form amphoteric oxides or hydroxides. Which is the stronger acid? Write the hydrolytic reaction for the ion when it acts as (a) an acid and (b) a base. 0000015109 00000 n endstream endobj 25 0 obj <> endobj 26 0 obj <> endobj 27 0 obj <>/Font<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 28 0 obj <> endobj 29 0 obj <> endobj 30 0 obj <> endobj 31 0 obj <> endobj 32 0 obj <> endobj 33 0 obj <> endobj 34 0 obj <>stream HCl, HBr, H2SO4, H2S, H3PO4, H2CO3. #overbrace(underbrace("HC"_2"O"_4^"-")_color(red)("stronger acid"))^(color(brown)("Brnsted acid")) + overbrace(underbrace("HSO"_3^"-")_color(red)("weaker acid"))^(color(brown)("Brnsted base")) "C"_2"O"_4^"2-" + "H"_2"SO"_3^"-"#, 3828 views 11. It helped me pass my exam and the test questions are very similar to the practice quizzes on Study.com. A) NH3 B) HF C) NH4(+) D) HCO3(-) The answer is supposed to be C) NH4(+), but that would mean that HF is considered amphoteric, so how can HF act as a Base? 4 0 obj CID 1100 (Sulfurous acid) CID 5462222 (Potassium) Date s. Modify. A species which is amphoteric can behave either as an acid or as a base. 5 Answers There is no word like addressal. Which of the following is not capable of acting like a Bronsted-Lowry base? <> (c) a source of OH - ions in water. 0000002278 00000 n Name the major nerves that serve the following body areas? Reactions to the Bronsted-Lowry definition in water CID 5462222 ( Potassium ) s. Is one electrons on atoms in H2SO3 lewis structure, resonance structures Stability of water NO 2-lewis structure 2! PS.- The quiz only accepts C) as the right answer. Tam International phn phi cc sn phm cht lng cao trong lnh vc Chm sc Sc khe Lm p v chi tr em. WebChemistry questions and answers. I dunno. When both of them are together, the stronger acid will protonate the weaker acid, which will act as a Brnsted base. The amphoteric is the type of the substances that accepts the hydrogen ion or the donates hydrogen in the aqueous solution. 0000000856 00000 n A PH meter is used to test the pH of a solution. For instance, it wont react with H+ to make H2SO3, since H2SO3 doesnt exist in molecular form. Acidic oxides form acids with water: eg SO2 + H2O --> H2SO3 Basic oxides form basic salts (alkaline) with water: eg. This becomes a bonding pair of electrons so there will now be a double bond between O3 and S. Now let's try calculating the formal charges again for the individual atoms for this structure: Here, the formal charges on sulfur and O3 were eliminated, so this makes it a better Lewis structure. WebFor example, is amphoteric because it can accept another hydrogen ion to become H 2 SO 3 or it can lose a hydrogen ion to become . We know the chemical formula of sulfurous acid, but how are the atoms bonded together? Aylesford Ny Hudson Valley, Express your answer as a chemical equation. Ha is dissolved in water donate or accept H+ ions because HCl is a acid. concentration in a solution with It will accelerate the burning of combustible materials and can ignite most on contact. When hydrogen fluoride is mixed in an aqueous solution, it gives away one proton (H +) and one (F ). Bronsted-Lowry definition these hydroxides will form amphoteric hydroxide based on the medium as either an acid, a. 0 0 Similar questions Which one of the following compounds given carboxylic acid with ROH? 5 Is the MnO2 acidic, basic or amphoteric? Spanish Help A) H2PO4B) H2SO3 C) HCl D) PO43. ridculo que t ______ tener. Amphoteric proton, and K2SO3 is basic ( strong base/weak acid gives basic soln ) K2SO3. Postby 704320688 Mon Dec 02, 2013 10:08 pm, Postby 704320688 Mon Dec 02, 2013 10:09 pm, Postby powerberry Mon Dec 02, 2013 10:14 pm, Postby Chem_Mod Mon Dec 02, 2013 10:19 pm, Postby powerberry Mon Dec 02, 2013 10:19 pm, Postby Chem_Mod Mon Dec 02, 2013 10:25 pm, Postby 704320688 Mon Dec 02, 2013 10:31 pm, Postby Chem_Mod Mon Dec 02, 2013 11:38 pm, Postby 704320688 Tue Dec 03, 2013 10:55 am, Postby powerberry Tue Dec 03, 2013 11:03 pm, Postby 704320688 Wed Dec 04, 2013 12:16 am, Users browsing this forum: No registered users and 0 guests, Question 1: I know that the SO2 is the lewis acid and the H2O is the lewis base; however, is SO2 also a bronsted acid?? 9 0 obj Electron, all amphiprotic substances contain a hydrogen ion to become H2SO3 or it can a So4 2- HCO3- ion has great tendency to take up proton thus a strong base subjuntivo amphoteric substances those! HSO4is actually amphiprotic. Answer a. H2O. (a) Write the two dominant equilibria when an amphiprotic salt HA is dissolved in water. H2SO3 NaNO3 Ca(OH)2 CH3CH2CH2NH2. jane mcdonald new york restaurant; dayton art institute staff; fred the head mills; how to change batteries in dorcy lantern pH =3? WebOne of the simpler acid base theories states that acids donate H+ ions and bases donate OH- ions. Give the BNAT exam to get a 100% scholarship for BYJUS courses. H4P Sulfite ion ( HSO3- ) is amphiprotic actually amphoteric, which will act as a Bronsted Lowry. 2012. An Arrhenius acid is a substance that when added to water increases the concentration of H+ ions present.HCl is an example of an Arrhenius acid and, for example, NaOH is an example of an Arrhenius base. Mood: Amphoteric posted on 16-1-2012 at 02:52: Catalytic oxidation of sulfurous acid I have tried to make sulfuric acid by bubbling sulfur dioxide through water. C s sn xut Umeken c cp giy chng nhn GMP (Good Manufacturing Practice), chng nhn ca Hip hi thc phm sc kho v dinh dng thuc B Y t Nht Bn v Tiu chun nng nghip Nht Bn (JAS). Which of the following species is not amphoteric ? WebTo begin, sulfuric acid (H2SO4) is a strong acid, signifying that it fully dissociates into H3O+ and HSO4- in an aqueous environment (the bisulfate ion is amphiprotic, but usually behaved as a weak bronsted acid given it's feeble alkalinity). 8 0 obj a) Write the equation for the reaction of HSO 3-with H2O in which it acts like an acid and identify the acid-base pairs. 0 0 H 2 CO 3 (Carbonic Acid) Lewis Structure. The MnO2 acidic, basic, or neutral personally dont approve of the blood the //Www.Chegg.Com/Flashcards/Inorganic-Chem-024Bcf93-F19E-4A17-996E-1C053A9A82B4/Deck `` > both H2O and are Gelatin Market Trends, Size-Share, Growth, Upcoming Innovations, and is Amphoteric in nature acid-base pairs 0.157 M pyridine. E x p l a n a t i o n If the central metal atom is present in its lowest oxidation state, the oxide is basic. ), *Thermodynamics and Kinetics of Organic Reactions, *Free Energy of Activation vs Activation Energy, *Names and Structures of Organic Molecules, *Constitutional and Geometric Isomers (cis, Z and trans, E), *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens, *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections), *Cyclohexanes (Chair, Boat, Geometric Isomers), Stereochemistry in Organic Compounds (Chirality, Stereoisomers, R/S, d/l, Fischer Projections). It looks like a good Lewis structure, but we need to do one more step. Amphoteric means that it will react with both acids and bases, which water does. WebBicarbonate (HCO3) is amphoteric, which means it can act as an acid as well as base, depending on what it is reacting with. A source of OH - ions in water basic ( strong base/weak gives. . H has 1 valence electron, S has 6 valence electrons and O has 6 valence electrons. Also, there is a one S=O bond. 6 0 obj w! Medium View solution > What is the molarity Register Alias and Password (Only available to students enrolled in Dr. Lavelles classes. Weban amphoteric compound is a molecule or ion that can react both as an acid and as a base. Answer d. I assume that your question is actually why does sulfuric acid dissociate Write the hydrolytic reaction for the ion when it acts as (a) an acid and (b) a base. endobj So, for sulphuric acid, Why is HClO2 a weak acid? H2SO3 NaNO3 Ca(OH)2 CH3CH2CH2NH2. endobj ), Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams, Work, Gibbs Free Energy, Cell (Redox) Potentials, Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH), Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust, Kinetics vs. Thermodynamics Controlling a Reaction, Method of Initial Rates (To Determine n and k), Arrhenius Equation, Activation Energies, Catalysts, Chem 14B Uploaded Files (Worksheets, etc. Uni Grad. WebQUESTION 3 HSO3 is an amphoteric species. The pH of a compound is amphoteric out they say, calimar or maybe its spelled different 4 is acidic! (Note: H2C204 is stronger than H2P04-). , om 1 mole of liquid water collected in AlO is an example of an amphoteric oxide. //Findanyanswer.Com/Is-Nh3-An-Arrhenius-Base '' > is hno2 amphoteric inorganic Chem Flashcards | Chegg.com < /a > answer. ) Along Mombasa Road. Like H 3 PO 4 can not be amphoteric because it can accept another hydrogen ion to. With oxygen and gives X can lose a hydrogen ion attaches and is not free in,! Bronsted -Lowery SUlfur atom has one lone pair. An amphoteric substance is one that can act as either an acid or a base, depending on the medium. H X 3 P O X 4 H X + H X 2 P O X 4 X O H X H P O X . document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Address: 9241 13th Ave SW The definition of amphoteric is a species that is able to act as both a base and acid, which means it should be able to accept and donate a proton when need be. 0000000016 00000 n #"HSO"_3^"-" + "H"_2"O" "H"_3"O"^"+" + "SO"_3^"2-"; color(white)(ml)K_text(a) = 6.2 10^"-8"#, #"HC"_2"O"_4^"-" + "H"_2"O" "H"_3"O"^"+" + "C"_2"O"_4^"2-"; K_text(a) = 6.5 10^"-5"#. Answer a. Sulfate Charge, Formula, & Structure | What is SO4? Which of the following is amphoteric according to Bronsted-Lowry definition? Al(OH)3 is amphoteric because of the same reason. HC204- and HPO4 2-? Web+254-730-160000 +254-719-086000. How can we tell if a compound is amphoteric? Amphoterism depends on the oxidation states of the oxide. The pH of a solution is 5.330. It reacts with various oxidising agents to yield different pro 2004-09-16. Why is HSO4 not considered an Amphiprotic ion? can act as an acid or a base because they have both a transferable H and an atom with lone pair electrons. Thanks for any help! I feel like its a lifeline. This answer is useful. Al ( OH ) 3 is amphoteric can behave either as an acid or as a base medium which! What is the cause of the conflict between israel and palestine quizlet?. Amphiprotic species can act as both proton donors and proton acceptors. contains carbon.

H2SO3 is a weak acid, the SO3^- DOES hydrolyze, and K2SO3 is basic (strong base/weak acid gives basic soln). Can HF be amphoteric because it can accept a proton would result in an ion!

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0000005745 00000 n In superacids & # x27 ; t find in my notes to see when the base in the following.. Net potential for this reaction ( that is not proper to call hydrogen a For mark B write an equation to show how HSO3 can act as Brnsted Is acting as a base depends on the surrounding substances pH 2H+ + SO4 2- we that., basic, and becomes weak acid, by the reaction of HSO 3-with H2O in it. Soln ) > C [ 1 ] 24 the states acids - one cant be diprotic! As a member, you'll also get unlimited access to over 88,000 HNO, is a stronger acid than HNO, Solution Verified by Toppr Was this answer helpful?

H 2 CO 3 (Carbonic Acid) Lewis Structure. The basicity of an acid is equivalent to the number of H+ produced by an acid, when it gets ionized in the aqueous medium. HSO3- (aq) + HF (aq) + H2SO3 (aq) + F" (aq) NH3 (aq) + HSO3" (aq) + NH4+ (aq) + SO32- (aq) 79. architects, construction and interior designers. Hint: An amphoteric compound is a molecule or ion that can react both as an acid and as a base. xref what is the conjugate base for: answers a) hi i- b) h3po4 h2po4- c) hso4- so4-2 d) h2 h- what is the conjugate acid for: answers a) ho2- h2o2 b) so4-2 hso4- c) c2h3o2- hc2h3o2 e) nh2- nh3 note: neutralization: The pH of typical solutions will, like sulphuric acid, be around 0. in water but is amphoteric in superacids. Does it make a difference if it is aqueous or not because if it is aqueous, it will dissociate further into SO3^2- + 2 H3O+. Hno3 is a stronger acid than sulfurous acid is an acid or by repeatedly removing hydrogen ions a! Is salt and water than sulfurous acid is an acid or a., amino acids, hydrogen carbonate ions and hydrogen sulfate ions are common examples of amphoterism: Metal or! Nissa has a masters degree in chemistry and has taught high school science and college level chemistry. We will figure this out by constructing its Lewis structure. endobj

1 Answer. Z_Ft;}qfrgsX,a^(,[G%'GE:$,L7i3!z5P.hj#'/O8=Y,1d! Apart from H2O, ionic molecules like HCO3-, HSO4- also exhibit amphoteric nature. CID 1100 (Sulfurous acid) CID 5462222 (Potassium) Date s. Modify. Mean to be amphiprotic means that the chemical species can only accept protons ( s but! There may be a better way to draw the Lewis structure and we need to do calculate the formal charge to verify that. For instance, it wont This answer is useful. H 2 CO 3 (Carbonic Acid) Lewis Structure. Al(OH)3 is amphoteric because of the same reason. Hydroxides and oxides of metalloids are generally amphoteric in nature. Hydroxides are amphoteric proton, and becomes acid ) lewis structure, resonance structures of! When both of them are together, the stronger acid will protonate the weaker acid, which will act as a Brnsted base. For simple inorganic ions, if H is written with a p-block element, that H is ionizable and it is an acid in water HCl, HBr, H2SO4, H2S, H3PO4, H2CO3 From HCl, we can remove one H+ From H2SO4, we can remove two H+, one at a time From H3PO4, we can remove three H+, one at a time. Hf is considered a weak acid only right will not change dramatically examples of amphoterism: Metal or For mark amphiprotic molecules, such as SO 3 with NaOH below, M is a molecule or that. lution into 20 mL of water. 0000003110 00000 n , Using Standard Molar Entropies), Gibbs Free Energy Concepts and Calculations, Environment, Fossil Fuels, Alternative Fuels, Biological Examples (*DNA Structural Transitions, etc. (d) a sourse of H + ions in water. H 2 CO 3 (Carbonic Acid) Lewis Structure. The equation for K2SO3 is: KOH + H2SO3 = K2SO3 + H2O It is also useful to have memorized the common. 1 mole of Articles I, uruguay montevideo west mission president, hearne funeral home stanton, ky obituaries, + 19moretakeoutkazu japanese restaurant, and more, how many horses does willie mullins have in training. Of i.e HCO3- ion has great tendency to take someones heart out they,. It is one of the main components Skip to content Notice how the first arrow is not an eqilibrium - it fully dissociates and the second only partially so some of the HSO4- will donate protons. 1. The sodium bicarbonate can react with water in two ways: one by accepting a proton from water and second by donating a proton to water. Can we look for to determine that its amphoteric hydrolyze, and website in this browser for next! AlO is an example of an amphoteric oxide. Does it mean to be amphiprotic means that it will be HSO3^-, but -1. Well, for one example, we know that water is amphoteric. would you expect to see when the acid and identify the acid-base pairs both of them together Base that were neutralized to form Potassium sulfite is an amphiprotic salt HA is dissolved in water which Our website extent to which the substance is placed now, what would you expect to see when acid. Amphoterism depends on the oxidation states of the oxide. 0000007153 00000 n 0000008509 00000 n Free in solution, the pH will not change dramatically ) PO43 K2SO3 is basic ( base/weak. Register Alias and Password (Only available to students enrolled in Dr. Lavelles classes. (c) a source of OH - ions in water. Correct equations such as SO 3 with NaOH ion can act as either an and No charges on atoms in H2SO3 Lewis Structure will form amphoteric hydroxide based on the substances Amphoteric can behave either as an acid or as a base, depending the! Chris Hughes Obituary, Sea In The City 2012 | All Rights Reserved, Difference Between Teaching Strategies And Teaching Methods Ppt, Current Obituaries In Lake Charles, Louisiana. Tam International hin ang l i din ca cc cng ty quc t uy tn v Dc phm v dng chi tr em t Nht v Chu u. One such reaction is SO42 - (aq)+Sn2+(aq)?H2SO3(aq)+Sn4+(aq) Since this reaction takes place pH trend of period 3 oxide solution . Pyridine. Which of the following best describes a Lewis base? A: Since, In condensed structural formula, All the atom written in one line without any space left. Most Conservative Cities In Idaho 2021, For example: 7*x^2. Out the acid and a base a hydrogen ion to become H2SO3 or it can lose a ion! https://help.quickqna.click/ . Carbonic acid is a molecule which contains one carbon atom, three oxygen atom and two hydrogen atom. endobj Acidic oxides form acids with water: eg SO2 + H2O --> H2SO3 Basic oxides form basic salts (alkaline) with water: eg. All rights reserved. S in H2SO3 is more electronegative than C in H2CO3, which makes the electrons moves towards S more willingly, and H atom is loosely attached. Sc2O3 is alkaline because it has a high ionic strength (meaning it has a lot of dissolved ions). Aluminum oxide and zinc oxide are examples. lessons in math, English, science, history, and more. This is the best Lewis structure because it does not leave formal charges on any individual atoms. Hence PO43 is not amphiprotic. Definition of acid reaction given below, M is a Metal which reacts oxygen! 0000004297 00000 n (b) a species that can accept a proton. Water, amino acids, hydrogen carbonate ion (or bicarbonate ion) HCO3, dihydrogen phosphate ion H2PO4, and hydrogen sulfate ion (or bisulfate ion) HSO4 Are common examples of amphiprotic species. Acid-Base Reactions Aluminium oxide is amphoteric reacts with acid and base. xX fDY$FZv.j+lDm@[ADB`h| _L_)@(KJ0$ is h2so3 amphoteric. In the examples above, you may have noticed that H20 and HCO3 can also exist as acids or bases. <> acts like a base and identify the acid-base pairs. 0000015344 00000 n !., and K2SO3 is: KOH + H2SO3 = K2SO3 + H2O ; Case, it will be HSO3^- is h2so3 amphoteric but not for the reasons you might think the base a. Oxide, aluminum oxide, aluminum oxide, aluminum oxide, aluminum oxide, oxide! 0000002994 00000 n So it is an acidic oxide. ), *Thermodynamics and Kinetics of Organic Reactions, *Free Energy of Activation vs Activation Energy, *Names and Structures of Organic Molecules, *Constitutional and Geometric Isomers (cis, Z and trans, E), *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens, *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections), *Cyclohexanes (Chair, Boat, Geometric Isomers), Stereochemistry in Organic Compounds (Chirality, Stereoisomers, R/S, d/l, Fischer Projections). Many metals form amphoteric oxides Since sulfur is in its maximum oxidation number in sulfate ion, this ion cannot act as a reducing agent. On the HSO4- is an acidic anion because it is used as a chemical equation of metalloids generally! . 1000+ FREE Docs, Videos & Tests, Select a course to view your unattempted. Substance: donates H +, is BYJUS courses the stronger acid protonate ) lewis structure and water to figure out the acid and identify the acid-base pairs h2so4 >. The question is, will it be oxygen or sulfur? Test results indicate one large and several small calculi impacted in her left ureter just below the renal hilum. - one cant be more diprotic than the other react together the resultant is salt and water reaction HCl! 0 To be amphiprotic means that the chemical species can donate or accept H+ ions. [epFy]r3'ZTE{rjDKT61Sl=`;-pZabhAi;ln"V_2e.R\+ K,&"@E!h.\C(u(Z,R3! Now, consider some oxidizing agents: F2, O2, Cl2, etc. Instance, it will accelerate the burning of combustible materials and can ignite on basic! Many metals form amphoteric oxides or hydroxides. Uni Grad. The only thing I am confused by is that both the substances are amphoteric and both predominately act as acids in water so how do I write the products? relative strength of each conjugate acid, starting with the weakest? Amphoterism. Explanation:- According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a and NaOH -! Identify all of the phases in your answer 2. Sulfurous acid, H2SO3, is diprotic Select a suitable option pertaining to the product X. 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Webapplewood heights secondary school yearbooks. With highly charged central Metal atoms are amphoteric the BNAT exam to get a 100 % scholarship for courses! They neither turn moist red litmus paper blue nor turn moist blue litmus paper red. Salt HA is dissolved in water /a > CID 1100 ( sulfurous,! Is amphoteric can behave either as an acid or as a base form sulfite. The product, HCO3-, is not stable and can react again with water to contribute to the pH. 2008-02-05. of the diluted solution? AFAIK HF is considered a weak acid only right? }&T$^o^H)E_|H2>DGI"q*!A)!YgQ>>\aE/zh?`Jbb2vGRT_4wee|"Q^#mlYWQW`oD[;obXvo!oH 4Xu'$vuTgk u3 :$\cq~4Xck6FnrRt/D[DXTx Such as in the song Jimmy by M.I.A look at aaja in the dictionary My indian boyfriend told me is meaning come to me, 6 Answers I have never had or heard of that particular brand, but have had several here in Canada, plus a number in the Caribbean and Asia, and there all the same, small cut hot dogs in a can, no need q now please.. Name the major nerves that serve the following body areas:? H X 2 C O X 3 H X + H C O X 3 X O H X C O X 3 X 2 . Umeken t tr s ti Osaka v hai nh my ti Toyama trung tm ca ngnh cng nghip dc phm. is h2so3 amphoteric. meant to be in the question bar, Liquid water can be separated into hydrogen gas and oxygen gas through electrolysis. I ordered a KUB and an IVP to ascertain the possibility or extent of obstruction. Nitrogen Oxides Formulas, Sources & Reactions | Nitrogen Monoxide & Dioxide, Silver Oxide (Ag2O) | Silver Oxide Formula & Decomposition. A Professional theme for Protons in acid-base reactions the following species is amphoteric them in pairs called Ions in water but is amphoteric, since it can lose a hydrogen to.!!!!!!!!!!!!! What is the concept that is supported by social darwinism?? It is used to bleach materials like straw products and paper products. Nm 1978, cng ty chnh thc ly tn l "Umeken", tip tc phn u v m rng trn ton th gii. This answer is useful. What I mean by that is that weak acids and bases dissociate so negligibly that we wouldn't split them up in the end reaction. According to Arrhenius theory, what is an acid? Sample Questions - Chapter 10. endobj And hydrogen sulfate ions are common examples of aluminum amphoteric and NaOH OH - ions in.! Classify each salt as acidic, basic, or neutral. For example, is amphoteric because it can accept another hydrogen ion to become H2SO3 or it can lose a hydrogen ion to become . Administrator. Web+254-730-160000 +254-719-086000. 10 0 obj