The Difference Between Sodium Hydroxide and Potassium Hydroxide

https://www.thespruce.com/sodium-hydroxide-vs-potassium-hydroxide-517051

So what’s the difference? They’re both white, flaky powders that make soap.  Quite simply:

  • sodium hydroxide (often called just “lye”) makes bar soap – solid, opaque bar soap
  • potassium hydroxide (often called “potash”) makes liquid soap – flowing, clear or translucent liquid soap
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