Question

How many grams of sodium chloride are contained in 2L of a 4% sodium chloride solution?

Answer 1

This is a solution concentration problem where units are given in %(m/v). so the equation to :

grams of solution

ccccccccccccccccccccccccccccc x 100 = %(m/v)

ml of solution

There are only 3 variables involved:

grams of solute = unknown

ml of solution = 2 lit. ie 2000ml

%(m/V) = 4.0

Rearranging and substituting into the equation:

gramsof solute = (ml of solution) x (%(m/v))

ccccccccccccccccccccccccccccccccccccccc

100

= 2000 x 4.0

ccccccccccccccccccccccccc

100

= 80gms

therefore, 80gms of sodium chloride id contained in 2lit of 4% sodium chloride solution.