The concentration of a solution is the ratio of the mass of the solute to the mass of the solution. The concentration can be expressed as a mass fraction or as a percentage.
In our case, the mass of the solute (zinc sulfate) should be
120 x 15% / 100% = 18 grams.
The mass of water is the difference between the mass of the solution and the mass of the solute: 120 – 18 = 102 grams.
Answer: To prepare 120 grams of a 15% zinc sulfate solution, you need 102 grams of water and 18 grams of zinc sulfate salt.
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