Препаративная химия

 
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Chemical process: synthesis and analysis

 
Детали

Продукт No: P1131701

Air - a mixture of the gases oxygen and nitrogen

Principle

 In this experiment the  composition of air is investigated. Therefor soild copper is heated on air. Copper combines with the oxygen of air and forms copper oxide. If this reaction is performed in a closed apparatus and the air volume is measured before and after the ...

 
Детали

Продукт No: P1133400

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.

Benefits

  • Compact setup
  • Perfect as ...
 
Детали

Продукт No: P3011400

Rectification - the number of theoretical trays in a distillation column

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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Детали

Продукт No: P3031501

Haloalkanes: Grignard reagent

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. ...

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Детали

Продукт No: P3101000

Haloalkanes: Wurtz reaction

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 ...

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Детали

Продукт No: P3101100

Toluene: Bromination in the nucleus



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 ...

 
Детали

Продукт No: P3101300

Preparation of p-toluenesulfonic acid

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 ...

 
Детали

Продукт No: P3101500

Cannizzaro reaction and reaction of benzaldehyde

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 ...

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Детали

Продукт No: P3101600

Quantitative determination of fat / Soxhlet extraction

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 ...

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Детали

Продукт No: P3120200

Titration of a weak acid with a strong base with the aid of a suitable indicator

What you can learn about
  •  Titration of a weak acid

 

 
Детали

Продукт No: P7510700

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