Is the Reaction in Acid or Base

Is the reaction in acid or base? Species Acid form Base form SO 3 2- HSO 3 - SO 3 2- ClO 3 - ClO 3 - ClO 3 - Cl - Cl - Cl - Mn 2+ Mn 2+ Mn(OH) 2 (s) ≡ MnO Pb 2+ Pb 2+ Pb(OH) 2 (s) ≡ PbO SO 4 2- HSO 4 - SO 4 2- NO 2 - HNO 2 NO 2 - Be able to identify whether the species in question is in its acid or base form. o If an acid species is in your reaction (either products or reactants), your reaction is in acid. o If a base species is in your reaction (either products or reactants), your reaction is in base. If you see the conjugate of a strong acid in your reaction, you know it’s in acid (for example, if you saw the highlighted species in your reaction, you know it’s in acid). Strong acids lose their hydrogen very easily and so you would see them as their conjugates. o Strong acids: HI, HCl, HBr, HNO 3 , HClO 3 , HClO 3 , and H 2 SO 4 o Only the first H of H 2 SO 4 is strongly acidic. Notice in the above table that SO 4 2- and SO 3 2- are basic species! This is because neither is a conjugate of a strong acid. Test whether you understand: The first problem we did in class together, the second are reactions from the book (problem 21.7 has the answer in the question). (1) In solution, thiosulfate ion will react with chlorine gas to produce chloride ion and hydrogen sulfate ions. Is this in acid or base?

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Transcript of Is the Reaction in Acid or Base

Is the reaction in acid or base?SpeciesAcid formBase form

SO32-HSO3-SO32-

ClO3-ClO3-ClO3-

Cl-Cl-Cl-

Mn2+Mn2+Mn(OH)2 (s) MnO

Pb2+Pb2+Pb(OH)2 (s) PbO

SO42-HSO4-SO42-

NO2-HNO2NO2-

Be able to identify whether the species in question is in its acid or base form. If an acid species is in your reaction (either products or reactants), your reaction is in acid. If a base species is in your reaction (either products or reactants), your reaction is in base. If you see the conjugate of a strong acid in your reaction, you know its in acid (for example, if you saw the highlighted species in your reaction, you know its in acid). Strong acids lose their hydrogen very easily and so you would see them as their conjugates. Strong acids: HI, HCl, HBr, HNO3, HClO3, HClO3, and H2SO4 Only the first H of H2SO4 is strongly acidic. Notice in the above table that SO42- and SO32- are basic species! This is because neither is a conjugate of a strong acid. Test whether you understand: The first problem we did in class together, the second are reactions from the book (problem 21.7 has the answer in the question).(1) In solution, thiosulfate ion will react with chlorine gas to produce chloride ion and hydrogen sulfate ions. Is this in acid or base? SH- (aq) + Cl2 (g) Cl- (aq) + HSO4- (aq)(2) Are the following reactions in acid or base? a. ClO3- (aq) + I- (aq) I2 (s) + Cl- (aq)b. MnO4- (aq) + SO32- (aq) MnO2 (s) + SO42- (aq)