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This laboratory activity involves measuring the enthalpy changes of dissolving ammonium chloride (NH4Cl) and calcium chloride (CaCl2) crystals in water. Students will use a calorimeter to measure the temperature change when the crystals dissolve, then calculate the heat (q) and enthalpy change (ΔH) of the dissolution reactions. They will determine if each process is exothermic or endothermic, and calculate the entropy change (ΔS) to determine if each process is spontaneous or non-spontaneous.

Author

homer

Language

EN