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Soap is made by the reaction of an alkali with a fat or oil. This is called saponification. When an alkali comes in contact with your skin, it saponifies the oil on your skin. So it isn't actually the alkali that is soapy.

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15y ago
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15y ago

No, they are not soapy themselves (that comes from the fats in your hand being turned into soap). They will feel like salt or sugar crystals before the soap effect hits (but don't taste the same).

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12y ago

It binds with the oils of your skin to make soap which causes it to feel slippery.

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14y ago

yes they do.

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Q: Why are alkalies soapy to touch?
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