Determination of the calorific value of olive oil with a demonstration calorimeter

VC6.1.4.1
Determination of the calorific value of olive oil with a demonstration calorimeter
Determination of the calorific value of olive oil with a demonstration calorimeter

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Description

Fats represent the most energy-rich group of the foods which are vital for the human organism. The mean physiological calorific value of fats is about 38.8 kJ/g. Apart from the supply of energy, however, the significance of fats lies also in the transport and resorption of fat-soluble vitamins and in the enhanced flavour of our dishes.
In experiment C6.1.4.1, the calorific value of olive oil is determined. For this purpose, olive oil is burned in an O2 atmosphere and the temperature rise is measured in the calorimeter. A filament is used to ignite the oil. The energy released is calculated using either a previously determined heat capacity of the filled calorimeter or the individual theoretical values of the heat capacities of the glass jacket and calorimeter liquid. The quantity of heat Q is calculated according to the following formula:

Here DT represents the temperature difference, mk and m(H2O) are the mass of the calorimeter and of the water, and Ck and C(H2O) are the heat capacities of the glass apparatus and the water. In order to calculate the heat of combustion DH, the ignition energy, which also contributed to the heating of the apparatus, must be subtracted. The quantity of heat is then expressed relative to one mol of substance.

Components of equipment sets

1 524013  8  Sensor-CASSY 2 LD
1 524220  8  CASSY Lab 2 LD
1 529676  4  Temperature probe, NiCr-Ni, 1.5 mm, type K LD
1 5240673  8  NiCr-Ni adapter S, type K LD
1 667325  8  Calorimeter for solids and liquids LD
1 666603  8  Base rail, 95 cm LD
4 666615  4  Universal bosshead LD
4 30127  4  Stand rod 50 cm, 10 mm Ø LD
5 666555  4  Universal clamp 0...80 mm LD
2 30172  4  Universal clamp, 0...120 mm LD
8 30109 Bosshead S LD
4 664800  4  Gas scrubber bottle, lower section, 200 ml LD
4 664805  4  Glass tube insert, ST 29/32 LD
4 665392  4  Joint clip plastic, ST 29/32 LD
1 521536  4  DC Power Supply 2 x 0...16 V/2 x 0...5 A LD
1 521231 Low-voltage power supply 3/6/9/12 V LD
1 666819  4  Stirring top, with GL 32 screw thread LD
3 50145  4  Connecting lead 19 A, 50 cm, red/blue, pair LD
1 667183  4  Rubber tubing, 1 m x 8 mm diam., DIN 12865 LD
1 667197  4  Silicone tubing, 4 mm diam., 1 m LD
1 604510  4  Tubing connector, 4...15 mm LD
1 609072  8  Round filter,90mm Ø, 100 pcs Typ 589 LD
1 ADAHCB3001  4  Precision Balance, 3000 g / 0,1 g LD
1 6677977 Electronic Balance 440-3N, 200 g : 0.01 g LD
1 660998  4  Minican pressurised gas canister, oxygen LD
GHS03GHS04 Danger H270 H280
1 660980  8  Fine regulating valve for minican gas canisters LD
1 6738420  4  Sodium hydroxide solution, 1 mol/l, 500 ml LD
GHS05 Danger H314 H290
1 6747850  4  Sulfuric acid, 95-98 %, 250 ml LD
GHS05 Danger H314 H290
1 6610821 Stopcock grease (grease stick) LD
1 additionally required:
PC with Windows XP/Vista/7/8/10 (x86 or x64)
1 additionally required:
olive oil
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