Anhydrous magnesium chloride, MgCl2, can absorb water to form the hydrated salt MgCl2.4H2O. Suggest one reason why the enthalpy change for this reaction cannot be determined directly by calorimetry.

Not possible to prevent some dissolving/ It is soluble / dissolves / other hydrates may form / difficulty to measure temperature change of a solid.

Answered by Alex H. Chemistry tutor

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