Química Preparativa

 
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Air- a mixture of the gases oxygen and nitrogen

 
Detalles

Num.Producto: P1133400

Aldehídos - reacciones con amoniaco

 
Detalles

Num.Producto: P1153000

Experimento modelo de la destilación fraccionada

Principle

When the model experiment on the distillation of petroleum is conducted using the comprehensive chemistry/biotechnology experiments system, the glass equipment clearly stands out against the dark background of the large-format base plate.  The strong contrast between this ...

 
Detalles

Num.Producto: P1308600

Determinación de masa molar por la ley de gases ideales

Principle

All gases may be considered, to a first approximation, to obey the ideal gas equation which relates the pressure p, volume V, temperature T  and amount of substance n of a gas. The amount of gas n is expressed as the number of moles and is equal to m / M  where m ...

 
Detalles

Num.Producto: P3010401

Condensation of gases through an increase of pressure and through cooling

Principle

Gases are condensing when they are cooled and at high pressure. In this experiment butane is condensed by cooling it to ca. -15 °C. In the second part of the experiment butane is condensed by compressing it.

Tasks

  1. Condense butane by cooling it under its ...
 
Detalles

Num.Producto: P3011400

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 ...

 
Detalles

Num.Producto: P3031501

Haloalcanos: enlaces de Grignard

Principle

Haloalkanes react with magnesium to the so-called Grignard reagents in accordance with the general formula RMgX. With X = bromide or iodide, the reaction works best. Chlorides are usually more inert and require higher temperatures and longer reaction times for the conversion. ...

 
Detalles

Num.Producto: P3101000

Haloalcanos: síntesis de Wurtzsch

Principle

Unlike the other alkali-organyls, lithium organyls - with the exception of methyllithium - show a stronger covalent behaviour. They dissolve rather well in organic solvents, such as diethyl ether, tetrahydrofuran, and alkanes, and they are relatively stable in these ...

 
Detalles

Num.Producto: P3101100

Bromación nuclear de tolueno



Principle

Bromine is polarised and, thereby, activated by zinc chloride as a Lewis acid. It can attach itself in an ionic manner to the toluene nucleus via several complex intermediate stages. Following a dehydrobromination, bromotoluene is formed, i.e. the product ...

 
Detalles

Num.Producto: P3101300

Preparación del ácido p-toluenosulfónico



Principle

This experiment examins the formation of p-tolune-sulfonic acid. The sulfonation of toluene with concentrated sulfuric acid is an electrophilic aromatic substitution. This means, the sulphonation of toluene is an electrophilic substitution at the aromatic compound. The ...

 
Detalles

Num.Producto: P3101500

Reacciones con benzaldehído (Phenylmethanal)

Principle

In the first part of the experiment, benzaldehyde disproportionates under the effect of alkalis to alcohol-soluble benzyl alcohol and water-soluble benzoic acid that precipitates when the aqueous solution is acidified. In the second part, benzaldehyde reacts with ethylene glycol ...

 
Detalles

Num.Producto: P3101600

Determinación cuantitativa de grasa - Extracción de Soxhlet

Principle

The discussion of healthy nutrition focuses on the fat content of foodstuffs. For this reason, it is important to know the exact fat content of individual foodstuffs. The experiment shown here presents a method for the quantitative determination of the fat content of foodstuffs ...

 
Detalles

Num.Producto: P3120200

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