Question

A tank that is used to decrease flow peaks initially contains 500 kg of a 25% aqueous solution of CH3COONa (sodium acetate). The tank operates originally in a stationary state, with feed and discharge flows of 100 kg / h of the solution. At a given moment, the feed to the tank changes to 130 kg / h of a solution with 30% acetate. If the flow at the outlet of the tank is maintained at 100 kg / h and if we assume that the system is perfectly mixed, it is asked.

a. An equation that predicts the total mass in the system as a function of time

b. An equation that predicts the composition of sodium acetate at the outlet of the tank as a function of time

c. What acetate composition will there be at the exit of the tank after 5 hours of the change?

Answer 1