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why is it less effective to wash an insoluble precipitate with 15 ml of water once,...

why is it less effective to wash an insoluble precipitate with 15 ml of water once, than it is to wash the precipitate with 3 ml of water 5 times See answers (1)

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Answer #1

It is done thrice because it is correct extraction process of your compound, if there are impurities which are water soluble they can be removed easily.

See, if u add 5 ml water first to insoluble PPT is can dissolve impurities which are water soluble and gives u your desired product with lest impurities and again u perform the same task again it dissolve impuritieswhich are left in your compound and performing the last time assure u that ur desired product with lest impurities or no impurities. And further extraction of your compound became simpler because there are less impurities left in your. COMPOUND

If you find my answer correct please give me a. IKE ?

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