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

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

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