Page 123 - Physics - XI

Thermometer B
4. Fill about half of the calorimeter with water Wooden screen
whose temperature is about 8 to 10°C below

room temperature. See that no vapours get
condensed over the calorimeter. Weigh it again. Thermometer A
5. Note the temperature of solid till the fi nal Hypsometer
temperature remains steady for about 10
minutes. Note the temperature and apply Solid
correction. Stirrer

6. Note the temperature of water in the Boiler Calorimeter Lid
calorimeter. Immediately after note down
this temperature, remove the cork along
with the thermometer from the copper tube
of hypsometer. Take out the tube, lift the

lid, and quickly transfer the solid to the
calorimeter. Stir the contents and note the Fig. 7.1: Determination of specifi c heat
fi nal temperature of the mixture. of solid by method of mixtures
7. Remove the thermometer A from the calorimeter very carefully (no water drop should be carried away
with it). Weigh the calorimeter with its contents and lid.

Observations
Reading of thermometer A = x = ______ °C
Reading of thermometer B = y = ______ °C
Correction to be applied to B = (x – y) = ______ °C

Mass of calorimeter and stirrer = m = ______ g
Specifi c heat of copper calorimeter = 0.095 cal g °C –1
–1
Water equivalent of calorimeter W = m (0.095) = ______ g

Mass of calorimeter + stirrer + lid = m = ______ g
1
Mass of calorimeter + stirrer + lid + cold water = m = ______ g
2
Steady temperature of hot solid = T' = ______ °C
Corrected temperature of hot solid = T' + (x – y) = T = ______ °C
Temperature of cold water = t = ______ °C

Temperature of mixture = θ = ______ °C
Mass of calorimeter, stirrer, lid, cold water, and solid = m = ______ g
3
Calculations

Mass of cold water = (m – m ) = ______ g
2 1
Mass of hot solid = (m – m ) = ______ g
3 2
Rise of temperature of cold water and calorimeter = (θ – t) = ______ °C
Fall in temperature of solid = (T – θ) = ______ °C
Heat gained by calorimeter, stirrer, and cold water = [W + (m – m ) (θ – t)] = ______ cal.
1
2
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