200 g 16%的硫酸铜溶液含有CUSO4的质量m=200g*16%=32g水的质量M2=200g-32g=168gCuSO4·5H2O-------cuso4---------------------5H2O250..............................160............................90m2.................................32g...........................M1m2=50g,M1=18g则需要的水的质量M=M2-M1=168g-18g=150g,cuso4.5H2O晶体50g...