Potassium cyanide reacts with this acid to form the corresponding dinitrile, which is converted by hydrochloric acid into citric acid.
They are precipitated from their alkaline solutions as cobalt sulphide by sulphuretted hydrogen, but this precipitation is prevented by the presence of citric and tartaric acids; similarly the presence of ammonium salts hinders their precipitation by caustic alkalis.
Moulds have been isolated which occasion the formation of citric acid from glucose.
Such, for instance, is the preparation of the elements of citric acid, which is manufactured at an establishment at Messina.
In soils where the potash available to citric acid is less than.
About 20 gallons of lemon juice should yield about 1 0 lb of crystallized citric acid.
When prescribed it is generally rendered more soluble in water by the addition of dilute sulphuric acid or of citric acid, one drop of the former or 4ths of a grain of the latter being used for each grain of the quinine sulphate.
Considerable trade is done in agro di limone or lemon extract, which forms the basis of citric acid.
The preparations of lithium used in medicine are: Lithii Carbonis, dose 2 to 5 grs.; Lithii Citras, dose 5 to io grs.; and Lithii Citras effervescens, a mixture of citric acid, lithium citrate, tartaric acid and sodium bicarbonate, dose 60 to 120 grs.
The acetone dicarboxylic acid, CO(CH 2 CO 2 H) 2, so obtained combines with hydrocyanic acid, and this product yields citric acid on hydrolysis.