50 g of the solution was evaporated to obtain 5 g of sodium chloride. Calculate the mass fraction of salt in the solution.

Any solution consists of water and a substance dissolved in it. If you evaporate all the water from the solution, then only the dissolved substance will remain.

We calculate the mass fraction of salt in the solution by the formula:

w (solution) = m (salt) * 100% / m (solution) = 5 * 100/50 = 10%.

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