RCOO-Na+ is formula of soap written everywhere but according to definition, it contains carboxylic acid, not COO only, and Kinross salts if Na is not present. why not RCOO-K+ or RCOOH-K+?

Generally sodium salts are used, thus formula of soap is written as RCOO-‚ÄčNa+. But it can be RCOO-K+ also.
Kindly refer to the following link:

https://www.meritnation.com/ask-answer/question/what-is-chemical-formula-of-soap-solution/science/5698376

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