Question

H2Q1- (aq) + ] ↔ HQ2-(aq) + H2C1-‑ K > 1 In the above reaction which...

H2Q1- (aq) + ] ↔ HQ2-(aq) + H2C1-‑ K > 1

In the above reaction which acid has the lowest pKa?   

Which base has the lowest pKb?

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Answer #1

Reaction:

H2Q-1 + HC-2 ↔ HQ-2 + H2C-1

In this reaction: H2Q-1 is an acid as it releases H+ ion, HC-2 is a base as it accepts H+ ion (by Bronsted-Lowry theory).

As K>1, reaction proceeds towards products, so the final products are more stable. As per rule of acid-base reactions, stable acids & bases are weaker in strength.

Lowest pKais of strongest acid, which is H2Q-1

Lowest pKbis of strongest base, which is HC-2

For any further doubts/feedback, please feel free to use the comments section!

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