cay asked in Science & MathematicsChemistry · 1 decade ago

Why does soap have to be washed with NaCl solution before it can be used on skin?

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  • Anonymous
    1 decade ago
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    Soap is made by reaction of fats with a caustic like NaOH or KOH. The resulting material will have left-over caustic in it, which is very harmful to skin, and needs to be removed before the soap can do more good than harm.

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