Chemistry

Problem

A solution is prepared by dissolving HF to give an initial concentration of

1.0 \times 10^{-6}\,\text{M}

25\,^{\circ}\text{C}

. Given

K_a(\mathrm{HF}) = 6.8 \times 10^{-4}

and

K_w = 1.0 \times 10^{-14}

, what is the pH of the solution after equilibrium is established? a) 4.58 b) 6.00 c) 7.00 d) 5.17