The Fundamentals of Colorimetry Pre-laboratory Question What is calorimetry? Wha
ID: 933328 • Letter: T
Question
The Fundamentals of Colorimetry Pre-laboratory Question
What is calorimetry? What is a calorimeter?
What do each of the variables represent in the equation q =m x cp x T?
q
m
cp
T
What are the appropriate units for each of the variables in the equation q = m x cp x T?
Laboratory Questions
What sort of relationship exists between the temperature change and the mass of the solid? Explain why that relationship exists.
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?
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
What were some potential sources of error in this investigation?
Suggest some ways in which the calorimeter or lab protocol could be improved to have lower percentage of errors.
Explanation / Answer
Calorimetry:
Measuring the change in energy of a chemical reaction is called Calorimetry.
Calorimeter:
The apparatus used to measure the change in energy is called called Calorimeter.
Theoretical Heat Transfer:
The basic principal of heat exchangers is based on the premise that colder fluid gains heat from a relatively hotter fluid while flowing over a conductive material in a heat exchanger. This is expressed by the following formula:
Qt = m x Cp x T, where:
Q (Bth/h) = Total heat load
m (lbs/h) = Mass flow rate of fluid
Cp (Btu/F, lbs) = Specific heat of fluid at constant pressure
T (F) = Change in temperatures between inlet and outlet of the fluid
This formula gives us theoretical heat load from a given fluid undergoing T temperature change at a mass flow rate m, with the fluid’s specific heat capacity Cp. It is a theoretical heat yield that can be transferred to or from a fluid.
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