Question

density of the solution of a salt X is 1. 15 gram per ml. 20 ml of the solution when completely evaporated gave a Residue of 4. 6 gram of the salt. Calculate the mass percentage of the solute in solution.

Answer 1

The mass of 20 mL of this solution is ( 20 * 1.15 ) g or 23 g, if it gives a residue of 4.6 g of the salt then obviously it contains the 4.6 g salt

Hence,

Mass % of solute is ( 4.6 g / 23 g ) * 100 or 20 %