Question

Consider a solution which is 0.10 M in HF and 0.15 M in KF. If 0.10 moles of NaOH is added to the solution, which of the following is true? The Ka for HF is 3.5 x 10^-4 (at 25ºC)

Group of answer choices

The pH of the solution will not change.

The buffer capacity of the solution will be exhausted.

The pH of the solution will decrease.

The Ka of HF will decrease.

Answer 1

Acidic busted solutions An acidic buffer solutions consists of a weak acid and été salt with a steens Base. acédic Better. HF +KF af The pH of the solution will not change. It is True If a small amount gr base colt is added, it reacts with Free HF forming Fanian and undissociated Walê 1HF toH s F +H2O The added ott ions all not free and all removed as undissociated watee. Hence pH of solution does not change. b) The buster capacity of the solution will be exhausted. It is not true. moles the pH of Busfee Capacity is defined as the numbee of of sterms acid for a stems Base required to change one litre buffee solution by one unit. c) The pH of the solution will decrease. It is not true statement- d) The ka of Hf we'll decrease, it is not Teue. when ott is added to HF, Then Hf dissociates more and hence ka value Increases.