Química

 
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Determinación de valores caloríficos para aceite de oliva

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, ...

...

 
Detalles

Num.Producto: P3021701

Diagrama de solubilidad de dos líquidos parcialmente miscib- les

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 ...

...

 
Detalles

Num.Producto: P3030501

Brecha de miscibilidad en un sistema terciario



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 ...

 
Detalles

Num.Producto: P3030601

Producto de solubilidad (con 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 ...

 
Detalles

Num.Producto: P3030862

Equilibrio de disociación con 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 ...

 
Detalles

Num.Producto: P3030960

Equilibrio de formación de complejos / Constante de equilibrio

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 ...
...

 
Detalles

Num.Producto: P3031001

Constantes de disociación

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 ...

 
Detalles

Num.Producto: P3031101

DESTILACIÓN DE VAPOR DE AGUA

Principio

El experimento sobre la destilación del vapor de agua con el sistema de camisa de vidrio puede ser construido y desarrollado cómodamente en el tablero para experimentos completos.

 
Detalles

Num.Producto: P3031251

Rectificación - determinación del número de bandejas teóri-cas en una columna de destilación

Principle

The separation power of a rectification (fractionating) column can be determined using an appropriate binary mixture whose equilibrium composition is measured in the distillation flask and in the domed glass head of the distillation apparatus. The number of theoretical trays can ...

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Detalles

Num.Producto: P3031501

Sublimación y solubilidad de Iodo

Principle

Iodine, whose melting point is at 113.5 °C, evaporates clearly below this temperature. It passes from the solid state directly to the gaseous state. This process is known as sublimation.

When iodine vapour cools down, solid crystals form, again without a liquid transitional ...

 
Detalles

Num.Producto: P3031900

Isoterma de adsorción

Principle

In general, the term adsorption is used to describe the attachment of gases or dissolved substances to the surface of a solid or liquid. At constant temperature, the quantity of adsorbed substances is a function of the type of system investigated and the partial pressure and / ...

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Detalles

Num.Producto: P3040801

Velocidad de reacción y energía de activación de hidrólisis ácida de acetato de etilo

Principle

In acid solution, ethyl acetate is hydrolysed to equivalent quantities of ethanol and acetic acid according to a pseudo-first order rate law. The alkalimetric determination of the acetic acid formed enables conclusions to be drawn on the temporal concentration of ...

 
Detalles

Num.Producto: P3050201

Cinética de la inversión de sacarosa

Principle

The inversion reaction of saccharose, which is catalysed by protons, produces invert sugar, which is a mixture of glucose and fructose. The reaction is accompanied by a change in the optical rotation of the system. Glucose rotates the polarisation plane of linearly polarised ...

...

 
Detalles

Num.Producto: P3050301

Conductividad de electrolitos fuertes y débiles (con Cobra4)

Principle

It is possible to differentiate between strong and weak electrolytes by measuring their electrical conductance. Strong electrolytes follow Kohlrausch's law, whereas weak electrolytes are described by Ostwald's dilution law. The examination of the concentration dependence of the ...

 
Detalles

Num.Producto: P3060660

Titulación conductométrica con Cobra4

Principle

The electric conductivity of aqueous electrolyte solutions is determined by the type and number of charge carriers at constant temperature. Characteristic changes in conductivity are connected with changes in the ionic composition of reacting systems. These can be used in the ...

 
Detalles

Num.Producto: P3060760

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