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|325. calcium sulfate |
[compositional specifications of calcium sulfate]
calcium sulfate contains 98.0～105.0% of calcium sulfate (caso4·2h2o).
calcium sulfate occurs as a white to light yellow-white powder or crystalline powder.
to1 gof calcium sulfate, add 100 ml of water, shake well, and filter. the filtrate responds to the tests for calcium salt and sulfate.
(1) clarity of solution : test solution weigh0.2 gof calcium sulfate, add 10 ml of diluted hydrochloric acid, and dissolve while heating. the turbidity of test solution should not be more than almost clear.
loss on ignition
the weight loss of calcium sulfate should be 18～24%
weigh accurately about1 gof calcium sulfate, add 40 ml of diluted hydrochloric acid, dissolve while heating on a water bath, cool, and add water to make exactly 100 ml. proceed as directed in under calcium salt determination, using this solution as the test solution.