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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