Page 27 - Lab Manual & Project class 12

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In this process enthalpy change takes place due to hydrogen
bond formation. The enthalpy change is an extensive
thermodynamic property, therefore, the heat evolved from the
system depends upon the amount of the liquid components
mixed. It is for this reason that the heat change is reported for
specified amount. Therefore, enthalpy change during mixing of
1 mol chloroform with 1 mol acetone is reported.

(∆H ) (∆H ) (∆H ) (∆H )
1 2 3 4
Heat gained by Enthalpy Enthalpy Enthalpy
+ + + = 0
calorimeter, change of change for change of
Maxbrain Chemistry
thermometer chloroform acetone interaction
and stirrer

∴ ∆H = – (∆H +∆H +∆H )
4
3
2
1

 

• Beaker (250 mL) : One

• Boiling tube : One
• Thermometer (110°C): One
• Cotton wool : As per need
• Glass rod : One • Chloroform : 20 mL

• Measuring • Acetone : 10 mL
cylinder (250mL) : One
• Piece of cardboard : As per need

• Stirrer : One



A. Determination of calorimeter constant
Chloroform
This may be determined in a manner detailed in previous
experiments; except that here instead of a beaker, boiling tube
may be taken and 8 mL of cold and 7.5 mL of hot water can be Acetone
used instead of 100 mL.

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24-04-2018