Question: one hundred pounds of solution containing 80 wt na2so4 must...
One hundred pounds of solution containing 80 wt% Na2SO4 must be obtained by evaporating a dilute solution using a double effect evaporator. If the evaporator from the 2nd effect is 60% of that coming from the first effect and the concentrate of the first effect contains 1 lb Na2SO4 per pound of water. Calculate for the composition of the feed.
a. 31% H2O, 69% Na2SO4 c. 45% H2O, 55% Na2SO
b. 45% H2O, 55% Na2SO4 d. 69% H2O, 31% Na2SO4