... lb /10 0 lb H2O 10 °C 65 lb /10 0 lb H2O 20°C 74.5 lb /10 0 lb H2O 30°C 10 2 lb /10 0 lb H2O At 10 0°F (37.8°C), solubility is (by extrapolation), 12 3.45 lb /10 0 lb H 2O At 40°F (4.4°C), solubility is 61. 92... at 10 0°C: the saturated solution is 31. 2% Na 2CO3; molecular weight of Na2CO3 is 10 6 SOLUTION: Assume 10 0 g of Na2CO3 10 H2O added into the saturated solution CHEMICAL ENGINEERING SERIES 18 CRYSTALLIZATION. .. tL = 15 C SWENSON-WALKER CRYSTALLIZER W t1 = 10 C t2 = 20 C C, ton/h Na2SO4 10 H2O tC = 15 C CHEMICAL ENGINEERING SERIES 26 CRYSTALLIZATION Consider heat balance: ( ) ( ) ( ) th From Table 2 -19 4