To 120 g of a 10% salt solution (NaCl), 30 g of water was added. Determine the percentage

| July 19, 2021 | education

To 120 g of a 10% salt solution (NaCl), 30 g of water was added. Determine the percentage of the resulting diluted solution.

When a salt solution is diluted with water, the concentration of this solution will change. The mass of the solute in this case will not change. Therefore, first we find the mass of salt in the solution, then we calculate the mass of the new solution, and only after that we determine the concentration of salt in it.

We calculate the mass of sodium chloride in solution:

m = 120 * 10/100 = 12 g. NaCl in solution.

Find the mass of the solution after dilution:

120 + 30 = 150 g – the mass of the solution.

Now let’s calculate what is the concentration of salt in the new solution:

w = (12/150) * 100 = 8%

Answer: 8% salt concentration after dilution



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