Question

A student is told to use 20.0 grams of sodium chloride to make an aqueous solution that has a concentration of 10.0 grams of sodium chloride per liter of solution. assuming that 20.0 grams of sodium chloride has a volume of 7.5 milliliters, about how much water will she use in making this solution?

Answer 1

Volume of the solution = $20.0 g NaCl * \frac{1 L solution}{10.0 g NaCl}$

= 2 L solution x $\frac{1000 mL}{1 L} =2000 mL$

Volume of solute = 7.5 mL

Volume of water (solvent) = 2000 mL - 7.5 mL = 1992.5 mL water