The mass fraction of sodium sulfate in the solution is 8.00%. To this solution weighing 60.0 g was added

The mass fraction of sodium sulfate in the solution is 8.00%. To this solution weighing 60.0 g was added solid sodium sulfate weighing 3.20 g. Determine the mass fraction in the resulting solution.

1. Determine the amount of sodium sulfate in 60 g of a solution with a concentration of 8%:
60 g * 8% / 100% = 4.8 g.

2. After 3.2 g of solid sodium sulfate was added to the solution, the solution was
4.8 g + 3.2 7 = 8 g sodium sulfate. In this case, the weight of the solution was 60 g + 3.2 g = 63.2 g.

3. Mass fraction (concentration) of sodium sulfate was:
8 g / 63.2 g * 100% = (12 + 213/316)%. Or about ~ 12.66%.

Answer: The mass fraction of sodium sulfate in the new solution was approximately 12.66%.