73. The pH of an aqueous solution of 1.5 M of ammonium acetate is (Given : pk, of CH3COOHand pKo of NH OH both are equal to 4.74 at 25°C)(1) 7(2) 6(3) 9.45(4) 9

73. The pH of an aqueous solution of 1.5 M of ammonium acetate is (G

1.	73. The pH of an aqueous solution of 1.5 M of ammonium acetate is (Given : pk, of CH3COOHand pKo of NH OH both are equal to 4.74 at 25°C)(1) 7(2) 6(3) 9.45(4) 9
Answer» m formate is a salt of weak acid and weak BASE. Hence, we APPLY the FORMULA,pK a =3.8, pK b =4.8pH=7+ 21 pK a − 21 pK b =7+(1/2)×3.8−(1/2)×4.8=7+1.9−2.4=6.5