Calorimetry -Water equivalent Calorimetry
Materials Required:
- Calorimeter
- Thermometer
- Stirrer
Reagents:
- Cold Water
- Hot Water
Procedure:
Water Equivalent Calorimeter
It is important to note that one should first select the sample “Cold water” to proceed with the simulation. Whenever the reading on the stopwatch becomes 4 minute 30 sec, one can then select the next sample “Hot water”.
Whenever the reading of the Hot water sample becomes 4 minute 30 sec, the next sample “Hot water + Cold water” can be selected.
- Select Cold water.
- Start the reaction by clicking the “Start” button.
- Note down the time and temperature up to 4 minute 30 sec.
- Insert the values in the worksheet.
- Find out the constant temperature (T2).
- Enter the value in the worksheet.
- Select Hot water. (It will be active only after the above procedure)
- Repeat steps 3, 4, 5, and 6 to determine T1.
- Select the mixture “Hot water + Cold water”.
- Repeat steps 3, 4, 5, and 6 to determine T3.
- Calculate the water equivalent of the calorimeter.
Note: It is assumed that at 4 minute 30 sec, the temperature of the calorimeter becomes a constant value.
Observations and Calculations:
| No | Time (sec) | Temperature (°C) | ||
|---|---|---|---|---|
| Cold Water | Hot Water | Mixture | ||
| 1 | 0 | |||
| 2 | 30 | |||
| 3 | 60 | |||
| 4 | 90 | |||
| 5 | 120 | |||
| 6 | 150 | |||
| 7 | 180 | |||
| 8 | 210 | |||
| 9 | 240 | |||
| 10 | 270 | |||
| 11 | 300 | |||
| 12 | 330 | |||
| 13 | 360 | |||
| 14 | 390 | |||
| 15 | 420 | |||
| 16 | 450 | |||
| 17 | 480 | |||
| 18 | 510 | |||
| 19 | 540 | |||
| 20 | 570 | |||
Temperature of water and calorimeter (T₁) = .................. °C
Temperature of cold water (T₂) = .................. °C
Temperature of mixture (T₃) = .................. °C
Heat Calculations:
Heat gained by hot water = 50 × (T₃ − T₂) = .................. cal
Water equivalent of calorimeter (W) = [50 × (T₃ − T₂) / (T₁ − T₃)] − 50 = .................. cal
Result
- Water equivalent of calorimeter = .................. cal
Points to Remember while Performing the Experiment in a Real Laboratory:
- Always wear lab coat and gloves when you are in the lab. When you enter the lab, switch on the exhaust fan and make sure that all the chemicals and reagents required for the experiment are available. If it is not available, prepare the reagents using the components for reagent preparation.
- Properly adjust the flame of the Bunsen burner. The proper flame is a small blue cone; it is not a large plume, nor is it orange.
- Make sure to clean all your working apparatus with chromic acid and distilled water and ensure that all the apparatus are free from water droplets while performing the experiment.
- Make sure to calibrate the electronic weigh balance before taking the measurements.
- Clean all glass wares with soap and distilled water. Once the experiment completed recap the reagent bottles. Switch off the light, exhaust fan and Gas cylinder before leaving the lab.
- Discard the used gloves in a waste bin.