Question

Find out the mass of a solvent present in 500g of 30% sodium chloride solution.

Answer 1

Given: Mass of solution = 500g, concentration of solution - 30%

we can use the following formula.

Concentration by mass (%) =$\frac{\mathrm{Mass}\mathrm{of}\mathrm{solute}}{\mathrm{Mass}\mathrm{of}\mathrm{solution}}$

So, 30% = $\frac{\mathrm{Mass}\mathrm{of}\mathrm{solute}}{500}$

Therefore, $\frac{30}{100}\times 500=150$

Therefore, Mass of solute = 150g,

Since, Mass of solution = Mass of solvent + Mass of solute,

Therefore, 500g - 150g = Mass of solvent = 350g.

Hence the mass of a solvent present in 500g of 30% sodium chloride solution is 350g.