Determination of enthalpy of mixing

VC4.3.3.4
Determination of enthalpy of mixing
Determination of enthalpy of mixing

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Description

When two substances A and B are mixed together without initiating a chemical reaction, heats of mixing are released or consumed. If the mixing process takes place at constant pressure, the heat of mixing is equal to the enthalpy of mixing.
The cause of the enthalpy of mixing lies in the differences of the interaction energies of the similar molecules in the pure components along with the interaction energy between the different types of molecules in the mixture. If the interaction between similar molecules is stronger than between dissimilar ones, the mixing requires energy, so the solution cools down. In the opposite case, the solution warms up.
Experiment C4.3.3.4 determines the enthalpy of mixing of two solutions with different concentrations and measures the heat of mixing released.

Components of equipment sets

1 524018  8  Pocket-CASSY 2 Bluetooth LD
1 5240031  8  * Bluetooth dongle LD
1 524019  8  * Rechargeable battery for Pocket-CASSY 2 Bluetooth LD
1 524220  4  CASSY Lab 2 LD
1 38640 Dewar flask, clear, for demonstration LD
1 529676  8  Temperature probe, NiCr-Ni, 1.5 mm, type K LD
1 5240673  8  NiCr-Ni adapter S, type K LD
1 664155  8  Watch glass dish, 100 mm diam. LD
1 607105  8  Magnetic stirrer mini LD
1 666850  8  Stirring magnet, 15 mm x 5 mm diam. LD
1 30011  8  Saddle base LD
1 30126  8  Stand rod, 25 cm, 10 mm diam. LD
1 30109  8  Bosshead S LD
1 602951  8  Measuring cylinder, Boro 3.3, 25 ml, glass base LD
1 665994  8  Graduated pipette, 1 ml LD
1 665997  8  Graduated pipette, 10 ml LD
1 666003  8  Pipetting ball (Peleus ball) LD
1 6700430  4  Acetone, 500 ml LD
1 6753400  4  Water, pure, 1 l LD
1 additionally required: PC with Windows 7 or higher

Articles marked with * are not essential, we do however recommend them to carry out the experiment.

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) C4.3.3.4 Determination of enthalpy of mixing (de)
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