VIII. 



DETERMINATION OF HYDROCHLORIC ACID IN THE 

 GASTRIC JUICE ACCORDING TO SJOQVIST. 



Twenty-five cubic centimeters of the hydrochloric acid 

 solution A (see page 33) and the same amount of the 

 lactic acid solution are mixed in a dry beaker. Ten cubic 

 centimeters of this mixture are then measured off with 

 a pipette, placed in an evaporating-dish, a few drops of 

 albumose solution and a small quantity of absolutely pure 

 barium carbonate l added, and the mixture heated on the 

 water-bath. During the heating the mixture is thoroughly 

 stirred with a thin glass rod. This is then rinsed off and the 

 mixture evaporated to dryness. The dry residue now con- 

 sists of barium chloride, barium lactate, excess of barium 

 carbonate, albumose, and the salts which may be present 

 and which are never absent from the fluids of the stomach. 

 This is now heated over a free flame and ignited gently until 

 most of the carbon is consumed (complete oxidation is super- 

 fluous) . By this means the organic substances are burnt up 

 or carbonized, the barium lactate is converted into barium 

 carbonate, while the barium chloride remains unchanged. 

 Let the dish cool, extract the residue with hot water, and 

 filter through a small filter of thin paper (for example, 

 Schleicher and SchuH's No. 590), of at most 9 cm. diameter. 



1 If the barium carbonate contains alkali carbonate, which is very 

 frequently the case, the amount of hydrochloric acid found will be too 

 low. 



237 



