Theory of dilute solutions

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Question

The freezing point of 1 m NaCl solution assuming NaCl to be 100% dissociated in water is – X⁰ C . The value of X is ( K _f =1.86 K .m^-1)

Moderate

Solution

$∆ T_{f} = 1.86 \times 1 \times 2 = 3.72; ∴ T_{f} = 0 - 3.72 = - 3.72 ° C N a C I d i s s o c i a t e s t o g i v e e x p e r i m e n t a l m o l a l i t y = 1 \times 2 = 2 .$

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