Question

can you solve this problem​

Answer 1

1. A suspension is a type of heterogenous mixture in which particles are suspended throughout and precipitate when left untouched. But, In a sol, (colloidal solution) The particles are charged are are smaller than those in suspension. Hence they do not precipitate when left untouched. However, Coagulation is done to precipitate particles of a Sol.
2. Concentration (m by m) = Mass of Common Salt / Mass of Water × 100
$\implies$Concentration (m by m) = 40/(240+40) ×100
= 40/280 × 100
=100/7
=14.28 %
$\therefore$ Concentration of Salt in water (mass by mass)=14.28% (Approx.)

Answer 2

Hey mate the above picture contains the answer.

Hope it helps...