H2s aq is a polyprotic acid meaning it can dissociate its, Ask an Expert

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H2S (aq) is a polyprotic acid, meaning it can dissociate its hydrogen ion more than once. However, HS- (given its negative charge as well as its extra hydrogen ion) can act as either a base or an acid, either accepting or donating hydrogen. Given the below equations and their K values, determine whether HS- is basic or acidic. Explain why.

H2S (aq) + H2O (l)--> HS-(aq) + H3O+ (aq) Ka=1.3*10^-7

S2- (aq) + H2O (l)--> HS- (aq) + OH- (aq) Kb=0.71

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Category:- Chemistry
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