What is a soap, what is it used for?
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Soap is chemically a sodium salt of stearic acid (an organic acid with the formula C17H35COOH) and has the formula C17H35COONa (sodium stearate, can be represented by NaSt).
Soap is used for washing & cleaning purposes.
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What are the causes for
(a) Temporary hardness
(b) Permanent hardness
State two ways, by which a saturated solution can be changed to unsaturated solution.
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