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Potassium Hydroxide Lye Of historical significance is the old method of boiling a solution of potassium carbonate (potash) with calcium hydroxide (slaked lime). A metathesis reaction occurs, precipitating calcium carbonate, leaving potassium hydroxide in solution Ca(OH)2 (s), (aq) + K2CO3 (aq) → CaCO3 (s) + 2 KOH (aq)
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