Abstract
A description is given of volumetric microdeterminations of formyl and acetyl groups in organic compounds. (1) Determination of the formyl group in the presence of the acetyl group: A sample was hydrolyzed with sodium hydroxide, and the hydrolyzate, after neutralization with sulphuric acid, was heated with mercuric chloride. Hydrochloric acid, potassium iodide, and excess iodine were then added, and the iodine consumed in the reaction was back-titrated with thiosulfate so that the formyl group could be determined. (2) Determination of the acetyl group in the presence of the formyl group: A sample was hydrolyzed with sodium hydroxide, and the hydrolyzate, after being acidified with phosphoric acid, was steam-distilled; the total acid in the distillate was titrated potentiometrically. As the formic acid in the total acid can be determined by (1), the acetyl group is determined as the residue.
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