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Application of Hess's Law to determine the enthalpy change of hydration of Magnesium sulphate
The first 200 words of this essay...
? Name: Penguin Chow Cheuk Yan ?
? Class: 6S Class Number: 14 ?
? Date: 04 - 11 - 2002 ?
Chemistry Full Report
Experiment 5
Title: Application of Hess's Law to determine the enthalpy change of hydration of Magnesium sulphate (VI)
Aim: Using Hess's Law to find the enthalpy change of hydration of magnesium sulphate (VI)
Theory: Hess's Law can be defined as the heat given off or absorbed by a reaction is independent of the route taken.
In this experiment, the enthalpy change of hydration of Magnesium sulphate (VI) cannot be directly measured by calorimetry in the laboratory as hydration is a very slow process.
?H1 = enthalpy change of hydration of MgSO4(S)
?H2 = molar enthalpy change of solution of hydrous MgSO4(S)
?H3 = molar enthalpy change of solution of MgSO4 7H2O(S)
According to Hess's law, the enthalpy of the overall reaction should be equal to the sum of the enthalpies of the two sub-reactions. Thus, this value can be calculated by applying Hess's Law
Procedure:
A. Determine the enthalpy change of solution of MgSO4(S)
1.
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