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580321_Chemistry The Fundamentals of Calorimetry_Q.docx

The Fundamentals of Calorimetry

Pre-laboratory Question

1. What is calorimetry? What is a calorimeter?

2. What do each of the variables represent in the equation q =m x cp x ∆T?

q

m

cp

∆T

3. What are the appropriate units for each of the variables in the equation q = m x cp x ∆T?

Laboratory Questions

1. What sort of relationship exists between the temperature change and the mass of the solid? Explain why that relationship exists.

2. How do the calculated molar heats of solution for calcium chloride compare to one another? How do the calculated molar heats of solution for ammonium chloride compare to one another?

3. The actual molar enthalpy of solution for calcium chloride is -81.3 kJ/mol, whereas the molar enthalpy of solution of ammonium chloride is 14.8 kJ/mol.

Calculate the average molar enthalpy of solution for each chemical based on your data, and then calculate the percentage error for each.

Discussion Questions

1. What were some potential sources of error in this investigation?

2. Suggest some ways in which the calorimeter or lab protocol could be improved to have lower percentage of errors.

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