硫酸钙溶解度测定方法具体是什么啊？

Solubility of CaSO4
Experiment 2

Major Concepts and Learning Goals
∙ Application of the solubility product constant (Ksp)
∙ Saturated solutions
∙ Le Chatlier’s Principle/Common ion effect
∙ Activities and activity coefficients
∙ Ion selective electrodes
∙ Calibration curves

Laboratory Task
∙ Produce a calibration curve using standard solutions of CaNO3
∙ Measure the activities of the calcium ion, ACa2+, of three different solutions
1) a saturated solution of CaSO4 in H2O
2) a saturated solution of CaSO4 in 0.10 M KNO3
3) a saturated solution of CaSO4 in 0.10 M Na2SO4
∙ Use concepts of ionic strength () and activity coefficient () to calculate the concentrations and activities of Ca2+ and SO42- in each of the three solutions
∙ Calculate Ksp for CaSO4 using the data from each of the solutions and compar