Heat Hydration of Cuso4

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F6/7 Chemistry Practical: Enthalpy of hydration of copper(II) sulphate Objective: To determine the enthalpy of hydration of copper(II) sulphate Group size: Individual
Introduction
This experiment enables an approximate determination of the enthalpy of hydration of copper(II) sulphate to be made. The enthalpy change when one mole of anhydrous copper(II) sulphate is dissolved in water is first determined. Secondly, the enthalpy of solution of copper(II) sulphate pentahydrate in water is determined. , Thirdly, the enthalpy of hydration of copper(II) sulphate is evaluated by using Hess's Law of Constant Heat (Enthalpy) Summation. ------------------------------------------------------------------------------------------------------------------------- Theory:

1. Define the terms 'enthalpy of solution' and 'enthalpy of hydration'. 2. [pic] is the enthalpy of solution for anhydrous copper(II) sulphate. [pic] is the enthalpy of solution for copper(II) sulphate pentahydrate. [pic] is the enthalpy of hydration of copper(II) sulphate. Draw an energy cycle to relate a) the dissolution of anhydrous copper(II) sulphate

b) the dissolution of copper(II) sulphate pentahydrate and c) the hydration of anhydrous copper(II) sulphate
3. By using the diagram in (2), give an equation to relate[pic], [pic] and[pic]. 4. In procedure A, temperature change, (, for the dissolution of anhydrous copper(II) sulphate is measured. Give a formula for the calculation of 'heat given out, Q' by using the temperature change. (Use the following symbols in your formula: mw for mass of water, ma for mass of anhydrous copper(II) sulphate, Cw for specific heat capacity of water, Ca for specific heat capacity of anhydrous copper(II) sulphate, ( is the temperature change) 5. Express [pic] in terms of Q.

---------------------------------------------------------------------------------------------------------------------- Procedure
A. Determination of heat of solution of anhydrous...
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