Question

To prepare a solution, 15 g of sodium chloride is dissolved in 85 g of water at 293 K. Calculate the concentration in terms of mass by mass percentage at this temperature.

Answer 1

Step 1:

Mass of the solute (sodium chloride) = 15 g

Mass of the solvent (water) = 85 g

Mass of the solution = Mass of the solute + Mass of the solvent

= 15 + 85 = 100 g

Step 2:

Concentration (mass by mass percentage) = $\frac{massofsolute}{massofsolution}\times 100=\frac{15}{100}\times 100$

= 15 %