Термохимия, калориметрия

 
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Enthalpy and entropy as driving forces of chemical reactions

Principle

The experiment examine the terms enthalpy and entropy as the main forces of chemical reactions. Students perform the reaction of zinc and hydrochloric acid as an example of an exothermic reaction. The heat, which is developed by the raction, is measured with a thermometer. The ...

 
Детали

Продукт No: P1136300

Determination of the enthalpy of vaporisation of liquids

Principle

The vaporisation of a liquid occurs with heat absorption. To determine the enthalpy of vaporisation, a known mass of the liquid which is to be investigated is vaporised in a special vaporisation vessel in a current of air. The quantity of heat absorbed, which corresponds to the ...

 
Детали

Продукт No: P3020461

Determination of the hydration enthalpy of an electrolyte (solution enthalpy) with Cobra4

Principle

When a solid electrolyte dissolves in water, a positive or negative heat effect occurs as a result of the destruction of the crystal lattice and the formation of hydrated ions. The enthalpy of hydration of copper sulphate can be calculated from the different heats of reaction ...

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Детали

Продукт No: P3020761

Determination of the enthalpy of neutralisation with Cobra4

Principle

When a strong acid is neutralised with a strong base in dilute solution, the same amount of heat is always released. If the reaction takes place under isobaric conditions, this heat is known as the enthalpy of neutralisation. The chemical reaction which generates this heat is ...

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Детали

Продукт No: P3020861

Determination of the melting enthalpy of a pure substance

Principle

When a solid melts, energy is required for the destruction of the crystal lattice. A substance whose melting point lies slightly below room temperature is first cooled until it solidifies and then melted in a calorimeter. The melting enthalpy is calculated from the decrease in ...

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Детали

Продукт No: P3020961

Determination of the heat of formation of water

Principle

Standard molar enthalpies of formation ΔBHΦ are important compiled thermodynamics tabulation quantities for calculating standard enthalpies of reaction for any arbitrary reaction. They are defined as the heat of reaction occurring in the direct formation of one mole of ...

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Детали

Продукт No: P3021501

Determination of the heat of formation for CO2 and CO (Hess'

Principle

The standard molar enthalpies of formation ΔBHΦ are important compiled thermodynamic tabulation quantities for calculating standard enthalpies of reaction for any arbitrary reaction. They are defined as the heat of reaction occurring in the direct formation of one mole ...

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Детали

Продукт No: P3021601

Hess's law with Cobra4

Principle

The standard molar enthalpies of formation ΔBHΦ are important compiled thermodynamic tabulation quantities for calculating standard enthalpies of reaction for any arbitrary reaction. They are defined as the heat of reaction occurring in the direct formation of one mole ...

 
Детали

Продукт No: P3021661

Determination of the heating value of fuel oil and of the calorific value of olive oil

Principle

The heat of reaction generated during the complete combustion of 1000 g of solid or liquid fuel is known as the calorific value H. In the case of complete combustion of nutritional fats, the gross calorific value can also be determined. In order to ensure complete combustion, ...

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Детали

Продукт No: P3021701

Solubility diagram of two partially miscible liquids

Principle

A number of different mixtures of phenol and water are prepared and heated until complete miscibility is achieved. As the mixtures cool, two-phase systems form at certain temperatures which are recognisable by the appearance of turbidity. Plotting separation temperatures against ...

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Детали

Продукт No: P3030501

Miscibility gap in a ternary system



Principle

A number of completely miscible two component mixtures are prepared to investigate the three component acetic acid / chloroform / water system. These mixtures are titrated with the third component until a two phase system is formed which causes turbidity. The phase ...

 
Детали

Продукт No: P3030601

Solubility product with Cobra4

Principle

The solubility of poorly soluble salts is expressed as the solubility product, i.e. the product of the concentration of cations and anions in the solution which are in equilibrium with the solid salt. These concentrations can be determined via conductivity ...

 
Детали

Продукт No: P3030862

Dissociation equilibrium with Cobra4

Principle

Carboxylic acids are potential electrolytes which exist in a weakly dissociated condition in aqueous solutions. The location of the dissociation equilibrium is quantitatively described by the Ka or pKa value which can be determined with ...

 
Детали

Продукт No: P3030960

Complex formation equilibrium / equilibrium constant

Principle

Many metals, in particular transition elements, can form complexes with charged or neutral ligands. Complex formation reactions are equilibrium reactions. The stability of these complexes is described by the complex formation constant.

Benefits

  • Stable and safe ...
...

 
Детали

Продукт No: P3031001

Dissociation constants

Principle

The coloured indicator thymol blue is a weak acid that is partially dissociated in aqueous solution, whereby  non-ionized and ionized forms show absorption maximums at different wavelengths in the visible range. Photometric measurements in the visible spectral range can ...

 
Детали

Продукт No: P3031101

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