Question

Calculate the pH of a buffer solution prepared by dissolving 0.20 mole of cyanic acid (HCNO) and 0.80 mole of sodium cyanate (NaCNO) in enough water to make 1.0 litre of solution.

K_a(HCNO) = 2.0 x 10^-4

1)0.97

2)4.30

3)3.10

4)4.40

5)3.70

Answer 1

2)4.30