A solution is obtained by mixing 300g of 25% solution ad 400 g of 40% solution by mass. Calculate the mass percentage of the resulting solution.

Explanation

Total mass of solution `=300+400=700g`
Mass of solute in 300g solution of 25% conc.
`=(25)/(100) xx 300 = 75g`
Mass of solute in 400 g solution of 40% conc.
`=(40)/(100) xx 400=160g`
Total mass of solute `=75+160=235g`
Total mass of solvent `=700-235 = 465g`
`:.%` age of solute after mixing `=(235)/(700) xx 100=33.57%`
% age of solvent after mixing `=(465)/(700) xx 100=66.43%`