Saturated solution of a solid is prepared at a constant temperature. 100 cm3of this saturated solution is evaporated in a china dish. The mass of the residue is called
A buffer of a 0.09 molar acetic acid and 0.11 molar sodium acetate has pH = 4.83. If 0.01 mole NaOH in 1 dm3of the buffer solution is added, then pH of the buffer becomes