pH

Determine pH of a 5% solution obtained by adding 25mL 0.1M HCl to 50mL 0.1M KNO2 solution.Ka=7*10^(-4).

1 Answers

1357

Manish Shankar ·2008-11-15 12:12:50

NO₂^-+HClâ†’HNO₂
mmoles 5 2.5 0
mmoles 2.5 0 2.5

pH=pKa (conc. of salt=conc. of acid)

=4-log7=3.15

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