A solution is prepared by mixing equal volumes of 0.40 M HF(aq)with 0.20 M KOH(aq).This solution is a buffer.

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A buffer is a solution that can resist changes in pH upon addition of small amounts of acid or base. To be a buffer, the solution must contain a weak acid and its conjugate base or a weak base and its conjugate acid. In this case, HF is a weak acid and KOH is a strong base that will completely dissociate in water to produce K+ and OH- ions. Mixing equal volumes of 0.40 M HF and 0.20 M KOH will result in the formation of KF and water according to the balanced chemical equation: HF(aq) + KOH(aq) -> H2O(l) + KF(aq). KF is the conjugate base of HF so the resulting solution will contain both HF and F- ions, making it a buffer solution.

A Solution Is Prepared by Mixing Equal Volumes of 0