What solution can be used to distinguish calcium hydroxide solution from sodium hydroxide solution?

With Na2CO3, calcium hydroxide solution if precipitated
Na2CO3+Ca (OH)2=2NaOH+CaCO3(precipitation symbol)

Similarities and differences between sodium hydroxide and calcium hydroxide

Identical points: all are hydroxide, all are alkali, all are soluble in water:1. Soluble in water, easily soluble in sodium hydroxide, slightly soluble (turbid solution) in calcium hydroxide.2. Dissolve a small amount in water, inject sodium carbonate solution, and the white precipitate is calcium hydroxide.

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