If an acid-base reaction has

CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases

Problem

If an acid-base reaction HA(aq)+B−(aq)⇌HB(aq)+A−(aq)\text{HA}(\text{aq}) + \text{B}^-(\text{aq}) \rightleftharpoons \text{HB}(\text{aq}) + \text{A}^-(\text{aq}) has Keq=10−4K_{\text{eq}} = 10^{-4} , how many of the following statements are true? (1) HB is stronger acid than HA (2) HA is stronger acid than HB (3) HA and HB have the same acidic strength (4) B−\text{B}^- is stronger base than A−\text{A}^- (5) A−\text{A}^- is stronger base than B−\text{B}^- (6) B−\text{B}^- and HB are conjugate acid-base pair (7) A−\text{A}^- is the conjugate base of acid HA. (8) HA can be HSO4−\text{HSO}_4^- and HB can be HCOOH\text{HCOOH} . (9) A−\text{A}^- can be F−\text{F}^- and B−\text{B}^- can be CN−\text{CN}^- .

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