What is the mass fraction of potassium chloride in the solution obtained by mixing 5g. this salt and 45g. water? Calculate the mass of salt that can be obtained by evaporating 90 g of such a solution?
Let’s find the mass of the solution. To do this, add the masses of water and salt.
M solution = M water + M salt = 5 + 45 = 50 grams;
To find the mass fraction of salt, it is necessary to divide the mass of salt by the mass of the solution.
With salt = M salt / M solution = 5/50 = 0.1 = 10%;
Find the salt content in 90 grams of the solution.
To do this, multiply the mass of the solution by the mass fraction of salt.
M salt 90 = 90 x 0.1 = 9 grams;
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