An aqueous solutions of an acid is weak that it can be assumed to be practically unionized, boiled at 100.4ºC 25 ml of this solution was neutralized by 38.5 ml of 1 N solution of NaOH. Calculate basicity of the acid if –1 k_b (H₂O) = 0.52 k mol kg . Assume molality is equal to molarity.

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answer is 2.

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Detailed Solution

$\begin{array}{l} {ΔT}_{b} = k_{b} \times m \\ 0 .4 = 0 .52 \times m \Rightarrow m = 0 .77 \\ 25 \times 0 .77 \times n^{'} = 38 .5 \times 1 \Rightarrow n = 2 \end{array}$

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