List of top Chemistry Questions on Buffer Solutions asked in KCET

A 0.15 mole of pyridinium chloride has been added to 500 cm\(^3\) of 0.2M pyridine solution (a base). Assuming there is no change in volume upon mixing, the pH of the resulting solution is
(Note: K\(_b\) for pyridine is 1.5 \(\times\) 10\(^{-9}\))

In a mixture of acetic acid and sodium acetate the ratio of concentrations of the salt to the acid is increased ten times. Then the pH of the solution :