To find the mass of a solution, it is necessary to divide the mass of the solute by its mass fraction.
M solution = M alkali / C alkali = 5.6 / 0.08 = 70 grams;
The mass of water will be equal to the product of the mass of the solution by the mass fraction of water.
M water = M solution x C water = 70 x 0.92 = 64.4 grams;
M solution = M water + M alkali = 5.6 + 64.4 = 70 grams;
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