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P.O.P, cement, calcium chloride should b...

P.O.P, cement, calcium chloride should be stored in moisture proof containers. Why?

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1) P.O.P, cement and calcium chloride are react with moisture `(H_2O)` in the atmosphere and set into hard solid masses.
2) To avoid availability of moisture they should be stored in moisture proof containers.
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VGS PUBLICATION-BRILLIANT-ACIDS, BASES AND SALTS -Section-2
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  2. What is conformation test for hydrous and anbydrous salt ?

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  4. Give some examples for hydrous and anhydrollls salts.

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