First slide

Theory of dilute solutions

Question

A 5% solution of cane sugar (molecular weight = 342) is isotonic with 1% solution of substance X. The molecular weight of X is

Moderate

Solution

For non-electrolytic solutions, if isotonic, C₁=C₂;
$= \frac{5 \times 1000}{342 \times 100} = \frac{1 \times 1000}{M w_{2} \times 100} ∴ M w_{2} = 68.4$

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