Question

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

Answer 1

Total amount of solute present in the mixture is given by

300x25/100+400x40/100

, = 75 + 160

 = 235 g

 Total amount of solution = 300 + 400 = 700 g

                                                                                                                                  235/700x100%

 Therefore, mass percentage (w/w) of the solute in the resulting solution,

 = 33.57% 

And, mass percentage (w/w) of the solvent in the resulting solution, 

= (100 − 33.57)% 

= 66.43%