`0.15` mole of pyridinium chloride has been added into `500 cm^(3)` of `0.2M` pyridine solution. Calculate pH and hydroxyl ion contration in the resulting solution, assuming no change in volume. `(K_(b)"for pyridine" = 1.5xx10^(-9)M)`

0.15 mole of pyridinium chloride has been added into 500 cm^(3) of 0.2 M pyridine solution. Calculate pH of the resulting solution, assuming no change in volume. (K, for pyridine = 1.5 xx 10^(-9) M)

K_(a) for butyric acid is 2.0xx10^(-5) . Calculate pH and hydroxyl ion concentration in 0.2M aqueous solution of sodium butyate.

0.15 mol of pyridinium chloride is added to 500 mL 0.2 (M) pyridine solution. Determine the pH of the solution. Given: K_(b) (pyridine) =1.5xx10^(-9) and assume that volume of the solution does not change due to the addition of pyridinium chloride.