Question

A solution of potassium chloride in water is 35% (m/v) The density of the solution is 1.2 g/ml. calculate the concentration of the solution in % (m/m)

Answer 1

$$\begin{gathered} Mass/Vol\%ofKCl=35\% \\ ThatmeansmassofKCl=35g \\ Volumeofsolution=100ml \\ Massofsolution=Volume\times density=100\times 1.2=120g \\ Mass/mass\%=\frac{Massofsolute}{massofsolution}\times 100=\frac{35}{120}\times 100=29.17\% \end{gathered}$$