laboratory tests

It is prepared in the laboratory by the action of iodine on ethyl alcohol or acetone, in the presence of alkali. This is called haloform reactio..

In laboratory, magnesium sulphate is prepared by dissolving magnesium, its oxide, hydroxide or carbonate in dilute sulphuric acid and evaporating the resulting solution, when colorless efflorescent crystals of the heptahydrate, MgSO 4 .7H 2 O, crystallize out. ..

Calcium carbonate is prepared in the laboratory by passing carbon dioxide gas into lime water. The resulting precipitate is filtered, washed and dried. The product obtained is known as precipitated chalk. Excess of carbon dioxide should be avoided since this leads to the formation of..

Air, free from moisture and carbon dioxide, is bubbled through boiling mercury. The oxygen of the air combines with the mercury to form mercuric oxide, which is a red solid (Fig.13.1)...

Laboratory Preparation of Alkenes - In the laboratory, alkenes are usually prepared from either alcohols or haloalkanes (alkyl halide..

Methane is prepared in the laboratory by the action of sodium acetate on soda lime. (Soda lime = NaOH + Ca..

In laboratory, oxygen can be produced by any one of the following method..

In the laboratory, alkenes are usually prepared from either alcohols or haloalkanes (alkyl halides..

Laboratory Preparation of Ammonia - For use in the laboratory, ammonia is prepared by heating an ammonium salt with a strong base. It can also be prepared by reacting a metal nitride with water. All ammonium salts heated with alkali evolve ammonia. Ammonium nitrate is not used i..

Any of the above mentioned methods could be used to prepare oxygen in the laboratory. Mercuric and silver oxides are not used for the preparation of oxygen, as they are very expensiv..