A saline solution with a concentration of 0.5 kg/L is introduced into a tank at a rate of 2 L/min. At the bottom of the tank, the mixture exits at a rate of 2 L/min. After 10 minutes, the inflow is replaced with pure water at the same inlet and outlet rates. If at the initial conditions there are 100 L of pure water in the tank, determine the salt concentration in the tank after 20 minutes of operation. Assumption: the density of pure water and salt solution is the same and the mixing takes place perfectly.

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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A saline solution with a concentration of 0.5 kg/L is introduced into a tank at a rate of 2 L/min. At the bottom of the tank, the mixture exits at a rate of 2 L/min. After 10 minutes, the inflow is replaced with pure water at the same inlet and outlet rates. If at the initial conditions there are 100 L of pure water in the tank, determine the salt concentration in the tank after 20 minutes of operation.
Assumption: the density of pure water and salt solution is the same and the mixing takes place perfectly.

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