If 25 g of salt is dissolved in 175 g of water, what is the concentration of the solution in mass percentage?
12.5%
Mass percentage of a solute is defined as \(\dfrac{\text{mass of solute}}{\text{mass of solution}} \times 100\), where the mass of solution equals the mass of solute plus the mass of solvent.
Mass of solute (salt) = 25 g; mass of solvent (water) = 175 g; so mass of solution = 25 + 175 = 200 g.
Mass % = \(\dfrac{25}{200} \times 100 = 12.5\)%.
Hence, the concentration of the solution is 12.5% by mass.
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