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The reaction between calcium ions (Ca²⁺) and hydroxide ions (OH⁻) to form solid calcium hydroxide (Ca(OH)₂) indicates a precipitation reaction, where a soluble ionic compound forms an insoluble solid. The enthalpy change (ΔH) of -16.71 kJ suggests that the reaction is exothermic, meaning it releases heat to the surroundings as it proceeds. This indicates a favorable reaction that results in the formation of a stable solid from its aqueous ions.

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