The _ salt of a long-chain fatty acid is called _.

Sodium or potassium

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soap

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Solution

Detergent is a substance that has cleansing properties in water.
Detergent is common soap.
Soap is defined as the Sodium and Potassium salts of long-chain fatty acids.
The general chemical formula of fatty acid is $RCOOH$ .
Therefore, the _Sodium or Potassium_salt of a long-chain fatty acid is called _soap_.

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