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What is revealed in the reaction ca2+(aq) + 2oh-(aq) ca(oh)2(s), deltah + 16.71?
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What is revealed in the reaction ca2+(aq) + 2oh-(aq) ca(oh)2(s), deltah + 16.71?

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The given reaction has a positive value of enthalpy change which means that it is an endothermic reaction. The heat energy flows into the reaction as it proceeds. So, to allow this reaction to occur heat should be supplied to the substances.
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