Answer to Question #337105 in General Chemistry for Thel

General Chemistry

Question #337105

Calculate the pH of a buffer made from 0.28 M HNO2 and 0.23 M NO2-. The Ka for HNO2 is 4.6×10-4

Expert's answer

pH = pK_a+ log A/HA

pKa = - logK_a= log 4.6•10^-4 = 3.34

pH = 3.34 + log (0.23/0.28) = 3.25

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