. Practical methods of organic chemistry . ine can also be obtained from finely pulverisedpotassium dichromate and crude concentrated hydrochloric acidby heating the mixture on the water-bath. To 1 litre of hydro-chloric acid, use 180-200 grammes of pulverised potassiumdichromate. 2. HYDROCHLORIC ACID Gaseous hydrochloric acid, which is frequently needed for thepreparation of acid-esters, is generated most conveniently in a 344 SPECIAL PART Kipp apparatus charged with fused ammonium chloride in piecesas large as possible, and concentrated sulphuric acid. The opera-tion is conducted in the same
. Practical methods of organic chemistry . ine can also be obtained from finely pulverisedpotassium dichromate and crude concentrated hydrochloric acidby heating the mixture on the water-bath. To 1 litre of hydro-chloric acid, use 180-200 grammes of pulverised potassiumdichromate. 2. HYDROCHLORIC ACID Gaseous hydrochloric acid, which is frequently needed for thepreparation of acid-esters, is generated most conveniently in a 344 SPECIAL PART Kipp apparatus charged with fused ammonium chloride in piecesas large as possible, and concentrated sulphuric acid. The opera-tion is conducted in the same way as that for the generation ofcarbon dioxide or hydrogen from a Kipp apparatus. If the apparatus is not available, the acid can be generated veryconveniently in the following manner: In concentrated hydrochloric acid contained in a suction flaskallow to flow from a separating funnel concentrated sulphuric acid,drop by drop (Fig. 82). The hydrochloric acid evolved is driedby passing it through concentrated sulphuric acid contained in a.
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