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 * (1 L solution)/(10.0 g NaCl)`

= 2 L solution x
`(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