Hanoi University Of Agriculture

Pyramidon reagent method ​ ​ ​ ​ In a test tube: 0.5 ml concentrated acetic acid, 2 ml urine, shake well; add 2 ml pyramidon 5% (in alcohol) and 0.5 ml H 2 O 2 3%. The mixture turns purple – positive reaction. Phenolphthalein method ( Collo method ) In a test tube, add 3 ml of urine and 3 ...

3.4. Physical properties Formic aldehyde is a gas with a pungent, unpleasant odor and is highly soluble in water. Other aldehydes and ketones are liquids or solids. Acetone has a slightly pungent odor. Benzaldehyde and many other aromatic aldehydes have a characteristic odor of almonds. In general, ...