Question

find the concentration of hydroxide,OH-, ions in a 0.100M solution of HNO2,nitrous acid

Answer 1

HNO2 -> H+ + NO2-
n(H+) = n(HNO2) so c(H+) = c(HNO2)
pH = - log [H+]
pH = 1

pOH = 14-pH
pOH = 13

pOH = -log [OH-]
10^-pOH = [OH-]
10^-13 = [OH-]
[OH-] = 1*10^-13 M