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Q.

If 40gm of $NaOH$ is added to 2 litre solution of 4M $NaOH$ , find the molality of final solution (density of solution =0.68 g/ml ).

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answer is 9.

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Detailed Solution

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$m = \frac{(1 + 8) \times 1000}{2000 \times 0 .68 - 9 \times 40} m = 9$

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