Determination of the heat of combustion of benzoic acid

VC4.3.3.1a
Determination of the heat of combustion of benzoic acid
Determination of the heat of combustion of benzoic acid

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Description

In experiment C4.3.3.1, the temperature rise in the demonstration calorimeter is measured while burning benzoic acid. The substance is weighed before and after the combustion process. The combustion takes place in an oxygen atmosphere, whereby ignition is initiated by a filament. 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 is the measured temperature difference, mk and m(H2O) are the mass of the calorimeter and of the water and Ck and C(H2O) is the heat capacity 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 and the quantity of heat must be expressed relative to one mol of substance.

Variant (a) is set up in a chemistry board system frame and variant (b) is set up on a base rail.

Components of equipment sets

1 666429  8  Calorimeter for solids and liquids, CPS LD
1 666428  8  Panel frame C100, two-level, for CPS LD
2 6664660  8  Adhesive magnetic board 300 mm LD
4 6664664  8  Holder, magnetic, size 4, 27...29 mm LD
4 664800  4  Gas scrubber bottle, lower section, 200 ml LD
4 664805  4  Glass tube insert, ST 29/32 LD
4 665392 Joint clip plastic, ST 29/32 LD
3 667312  4  Glass connector, 2 x GL 18 LD
1 301312  8  Console LD
1 72621  8  Equipment platform, 350 mm LD
1 524013  4  Sensor-CASSY 2 LD
1 524220  4  CASSY Lab 2 LD
1 5240673  4  NiCr-Ni adapter S, type K LD
1 529676  4  Temperature probe, NiCr-Ni, 1.5 mm, type K LD
3 667312  4  Glass connector, 2 x GL 18 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 521536  4  DC Power Supply 2 x 0...16 V/2 x 0...5 A LD
1 521231  8  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 660998  4  Minican pressurised gas canister, oxygen LD
GHS03GHS04 Danger H270 H280
1 660980  4  Fine regulating valve for minican gas canisters LD
1 ADAHCB3001  4  Precision Balance, 3000 g / 0,1 g LD
1 6677977  4  Electronic Balance 440-3N, 200 g : 0.01 g LD
1 608360  4  Pestle, 54 mm long LD
1 667092  4  Mortar porcelain 70 mm Ø LD
1 6708300  4  Benzoic acid, 50 g LD
GHS07 Warning H302 H319
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 additionally required: PC with Windows 7 or higher
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