Chemistry 9701 · AS & A Level · Equilibria

Equilibria — practice question

An aqueous solution X contains the substance HQ, which acts as a weak acid. $\text{HQ(aq)} \rightleftharpoons \text{H}^+(\text{aq}) + \text{Q}^-(\text{aq})$ The soluble salt NaQ is then introduced into X. What effect does this have on the $[\text{H}^+(\text{aq})]$ and on the pH of X?

  • A$[\text{H}^+(\text{aq})]$ decreases, pH decreases
  • B$[\text{H}^+(\text{aq})]$ decreases, pH increases
  • C$[\text{H}^+(\text{aq})]$ increases, pH decreases
  • D$[\text{H}^+(\text{aq})]$ increases, pH increases

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