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Using test tubes, I will have three "sets" of things to measure the solubility. They will be asked to put the same amount into each test tube, and then judge "qualitatively" which will dissolve the easiest and the best. Afterwards, make a conclusion based on what you see. . For example, Sodium chloride, calcium chloride, Tin chloride, the pattern should be obvious. . Have a worksheet/table for them to fill out as well. .