Question: 1. (a) Why is Ka2 smaller than Ka1 for a polyprotic acid? Be specific, and answer WHY not just WHAT (i.e. dont define a term

1. (a) Why is Ka2 smaller than Ka1 for a polyprotic acid? Be specific, and answer WHY not just WHAT (i.e. dont define a term in the question to answer a question).

(b) A solution of HA, after diluting, has the acidity decrease but the % dissociation increase. Explain why the percent dissociation for a weak acid increases as the concentration of the acid decreases. HINTS: write out the Ka expression for a generic acid, we are not asking you about the mathematics of fractions and think about Le Chteliers Principle!

(d) Is an aqueous solution of ammonium hydrogen sulfide acidic, basic or neutral? Explain your reasoning.

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