# How can potassium hydroxide be prepared from available potassium chloride (KCl) and Quick Lime (CaO)

I live in a small town where Potassium hydroxide is not readily available. (I need above for preparing liquid soap.) But Potassium chloride (KCl) and Quick Lime (CaO) are available as fertilizer and White-wash ingredients respectively. Can KOH be prepared from above ingredients? What will be reaction conditions?

• Any crudely prepared KOH will pose a lot of problems. Calcium forms scum. – M. Farooq Jan 11 at 1:59

Mixing $$\ce{KCl + CaO}$$, or $$\ce{KCl + Ca(OH)2}$$, will never produce pure $$\ce{KOH}$$ without $$\ce{Ca(OH)2}$$. And this Ca(OH)2 will prevent soap from being synthesized out of oil, as $$\ce{(Ca(OH)2}$$s destroy soap in case a little bit of soap has been synthesized. The only way of producing $$\ce{KOH}$$ out of $$\ce{CaO}$$ or $$\ce{Ca(OH)2}$$ is to mix it with potassium carbonate $$\ce{K2CO3}$$. Of course $$\ce{Ca(OH)2}$$ is not very soluble in water. But $$\ce{CaCO3}$$ is still more insoluble. So the following reaction is possible :$$\ce{Ca(OH)2 + K2CO3 -> 2 KOH + CaCO3(s)}$$ And the insoluble $$\ce{CaCO3}$$ can be filtrated to produce a KOH solution