Question

What is the hydrogen ion concentration of a buffer solution containing 0.10 M NO2− and 0.20 M HNO2? Ionization Constant for Nitrous Acid, Ka = 4.5 x 10–4

a)2.2 x 10–4 M
b) 9.0 x 10–4 M
c) 4.5 x 10–4 M
d) 9.5 x 10–3 M