Question

What mass of water is added to 255g of salt to make a 15% by mass solution?
A: 1400g
B: 1445g C: 1700g D: 1850g

Answer 1

Ouestion

What mass of water is added to 255g of salt to make a 15% by mass solution?

Answer

• To make the salt solution of 15% with 15 gm as the mass of the solute, the mass of the solvent must be 85 gm. Therefore, 85 gm of water should be added.

Solution :-

I am assuming solution 7.50%

by mass.

Concentration by mass = mass of solute/mass of

solution *100%7.50% = 15.0 g

/(15.0 g + x g) *100%x - mass of

water that must be added

.15.0 g + x g = (100%*15.0 g)

7.50%x g = 200. g - 15.0 gx =

185 gram. You must add 185 gram of water.