Ka for butyric acid is 2.0×10−⁵. Calculate pH and hydroxyl ion concentration in 0.2 M aqueous solution of sodium butyrate.
a.pH=5;[OH]−=10−⁹M
b.pH=5;[OH]−=10−⁵M
c.pH=9;[OH]−=10−⁹M
d.pH=9;[OH]−=10−⁵M