Take about lO g ( llm l) of this product, place it in a test tube with a stopper, Add 10ml of calcium hydroxide test solution, shake well, and compare it with 10ml of 0.01% anhydrous sodium carbonate solution, which is made with the same method, no more concentrated (0.006%). Compared with the control solution made of 0M l, it should not be more concentrated (0.0005%). Take about 20g(22ml) of this product, put it on a water bath to evaporate dry, add 25ml of water to dissolve the residue, check according to law (General rule 0802), and standard potassium sulfate solution 1. Add 20ml of water to dissolve the residue, and then check it according to law (General rule 0801), not more concentrated (0.0001%) than a control solution made of standard sodium chloride solution. Take about lO g (llm l) of this product, put it on a water bath and evaporate it to dryness.
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