According to the Arrhenius definition, Ca(OH)₂ is a Arrhenius base.
According to the Arrhenius theory, acids are those substance which gives H⁺ ion in the aqueous solution and bases are those substances which gives OH⁻ ion in the aqueous solution.
Chemical equation for the dissociation of Calcium hydroxide is:
Ca(OH)₂ → Ca²⁺ + 2OH⁻
From the above equation it is clear that Ca(OH)₂ is an Arrhenius base as it gives hydroxide ion.
Hence, Ca(OH)₂ is a Arrhenius base.
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