Consider a weak base 'B' of pKb = 5.699. 'x' mL of 0.02 M HCl and 'y' mL of 0.02 M weak base 'B' are mixed to make 100 mL of a buffer of pH 9 at 25ºC. The values of 'x' and 'y' respectively are: [Give

Question

Consider a weak base 'B' of pKb = 5.699. 'x' mL of 0.02 M HCl and 'y' mL of 0.02 M weak base 'B' are mixed to make 100 mL of a buffer of pH 9 at 25ºC. The values of 'x' and 'y' respectively are: [Given: log 2 = 0.3010, log 3 = 0.4771, log 5 = 0.699]

(A) x y 11.1 88.9
(B) x y 42.7 57.3
(C) x y 14.3 85.7
(D) x y 85.7 14.3

Prashant Kotian · Accepted Answer

Correct answer: C. HCl + B  BH + + Cl – 0.02M 0.02M x ml y ml tf 0 0.02y–0.02x 0.02x         b Salt pOH pK log Base         Salt 5.699 log Base x y x   6x = y 7x = 100 x ml  & y ml 

💡 Solution & Explanation

Practice 22,000+ questions like this