Question

A 12.34 mL solution with an unknown salt concentration has a mass of 10.25 g. When the water was evaporated from the solution, 4.78 g of NaCl remained. Calculate the mass-volume percent NaCl concentration in the solution.

Answer 1

mass/volume percent of the NaCl solution is 38.74%

Explanation:

Mass volume percent of a solutions is defined as:

mass/volume percent = [mass of the solute (g) / volume of the solution (mL)] × 100

For our problem we have:

mass of the solute = 4.78 g of NaCl

volume of the solution = 12.34 mL

mass/volume percent =  [4.78 / 12.34] × 100

mass/volume percent = 38.74%

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concentration of a solution

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