(a) 1.22 g C_6H_5COOH is added into two solvents, acetone and benzene and data of DeltaT_b and K_b are given as

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Q 2528478301.     (a) 1.22 g C_6H_5COOH is added into two solvents, acetone and benzene and data of DeltaT_b and K_b are given as

(i) In 100 g acetone, Delta T_b = 0.17, K_b = 1.7 kg K/mol
(ii) In 100 g benzene, DeltaT_b = 0.13 and K_b = 26 kg K/mol

Find out the molecular weight of C_6H_5COOH in both cases and interpret the result.

(b) 0.1 M of HA is titrated with 0.1 M NaOH, calculate the pH at the end point. Given: K_a (HA) = 5.6 xx 10^-6 and a < < 1.
JEE 2004 Mains

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