Question

Assume the depth of salt water in a fishtank is 1.5 inches (recall that the inside diameter of the tank was 1.6 inches). If the salt concentration of the water is 0.06 wt% NaCl, compute the final salt water concentration after 2 cm3 of water with 1.5% wt NaCl is added to the fishtank. Assume the same amount of water that you add also leaves the through the overflow, where 82% of the water leaving is 0.06% wt NaCl and 18% of the water leaving is 1.5% wt NaCl.

Answer 1

as per given problem volume remain constant. so whatever water is added same amount of water comes out of the tank. To solve this problem we need to know final mass of solution and final mass of salt and then we use

%wt= (mass of solute/mass of solution)

mass of solution = density x volume of solution