Solutions volumes should be carefully measured with a graduated cylinder. Add solution
completely, to a dry calorimeter. Don't forget to add the spin bar each time!
Set up the calorimeter with the thermometer (0° to 50°C, graduated every 0.1°C)
supported from a stand so that the bulb does not touch the bottom of the cup. Note that
the thermometer used for calorimetry differs from the less accurate one in your glassware
drawer. Clamp the calorimeter so that it rests on the stirrer. Be careful not to turn on the
heat or you will melt the Styrofoam.
The change in temperature is determined by measuring the initial temperature, T1, of the
reactants, and the maximum temperature, T2, of the contents of the calorimeter during the
exothermic reaction. Use a magnifying glass to measure temperature values precisely.
Interpolate between the divisions of the thermometer and record temperatures to +/- 0.01
°C. See your lab manual for a discussion of how to determine accurately the change in
temperature from your graph of temperature vs. time.
sharon kalunda answered the question on April 12, 2019 at 06:29
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