Question

What is the concentration of hydronium ions in a solution which is 0.5M with respect to nitrous acid and 0.65M with respect to sodium nitrite. Assume that sodium nitrite is completely ionized?

Answer 1

concentration of H₃O⁺ of 0.5M Nitrous acid

pH=-log(molarity)

pH=-(log0.5)

=--0.3

pH = 0.3

H₃O⁺=10^-pH

⁼10^0.3= 1.99

concentration of H₃O⁺ of 0.65

pH=-(log 0.65)

pH=0.187

H₃O⁺=10^-0.187

=0.645