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Determination of the enthalpy of combustion with a calorimetric bomb

Determination of the enthalpy of combustion with a calorimetric bomb

Item no.: P3021401

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  • Description
  • Scope of Supply
  • Accessories
  • Downloads and Documents

Principle

The bomb calorimeter is used to completely burn substances in an excess of oxygen. The heat of combustion released is absorbed by the calorimetric vessel in which the bomb is immersed, and results in a temperature increase ΔT. The heat capacity of the system is first determined by adding a defined amount of heat from the combustion of benzoic acid. The combustion of the naphthalene is subsequently performed under the same conditions.

Benefits

  • Good and reproducible results due to temperature control in the experiment.
  • Only a small amout of chemicals is need for the experiment due to the good heat capacity of the calorimeter.

Tasks

  1. Determine the enthalpy of combustion of naphtalene using a bomb calorimeter.
  2. Calculate the enthalpy of formation of naphthalene from the enthalpy of combusting unsing Hess' law.

What you can learn about

  • First law of thermodynamics
  • Hess' law of constant heat summation
  • Enthalpy of combustion
  • Enthalpy of formation
  • Heat capacity

Necessary accessories

  • Precision balance 620g/0.001g
  • Precision balance 6200g/0.01g

 

Device Name Item no. Qty
Calorimetric bomb 04403-00 1,00
Test vessel f.calorim.bomb,10 pcs 04403-03 1,00
Pressure tube with fittings 39299-00 1,00
Calorimeter, transparent, 1200 ml 04402-00 1,00
Magnetic stirrer with heater MR Hei-Standard 35751-93 1,00
Magnetic stirring bar 30 mm, oval 35680-04 1,00
Supp.rod stainl.st.,50cm,M10-thr. 02022-20 1,00
Right angle boss-head clamp 37697-00 2,00
Universal clamp 37715-00 2,00
Temperature meter digital, 4-2 13618-00 1,00
Universal power supply600mA 3V/ 4,5V/ 5V/ 6V/ 7,5V/ 9V/ 12V incl. 8 adaptors 11078-99 1,00
Immersion probe NiCr-Ni, teflon, 300 °C 13615-05 1,00
PHYWE power supply, universal DC: 0...18 V, 0...5 A / AC: 2/4/6/8/10/12/15 V, 5 A 13504-93 1,00
Connecting cord, 32 A, 750 mm, black 07362-05 2,00
Steel cylinder oxygen, 2 l, filled 41778-00 1,00
Reducing valve f.oxygen 33482-00 1,00
Table stand for 2 l steel cylinders 41774-00 1,00
Wrench for steel cylinders 40322-00 1,00
Weighing dishes, square shape, 84 x 84 x 24 mm, 25 pcs. 45019-25 1,00
Mortar w. pestle, 70ml, porcelain 32603-00 1,00
Pellet press for calorimeter 04403-04 1,00
Graduated beaker with handle, 1000 ml, plastic (PP) 36640-00 1,00
Digital stop watch, 24 h, 1/100 s and 1 s 24025-00 1,00
Microspoon, steel 33393-00 1,00
Wash bottle, plastic, 500 ml 33931-00 1,00
Funnel, diameter = 50 mm, plastic (PP) 36890-00 1,00
Scissors,straight,blunt,l 140mm 64625-00 1,00
Iron wire, d = 0.2 mm, l = 100 m 06104-00 1,00
Naphthalene white 250 48299-25 1,00
Water, distilled 5 l 31246-81 1,00
Title Item no.
Required Accessories
Document     Filesize
p3021401e.pdf Experiment guide, English 308.54 KB

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