Propionic Acid, CAS No. : 79-09-4

Synonyms: Propanyl acid
CAS Number: 79-09-4, Molecular Weight: 74.08, Chemical Formula: CH3CH2COOH, EINECS EC Number: 201-176-3, FEMA: ----,

Propionic Acid USP NF Grade Specifications
Propionic Acid contains not less than 99.5 percent and not more than 100.5 percent, by weight, of C3H6O2.

Specific gravity: between 0.988 and 0.993.
Distilling range: between 138.5 and 142.5.
Heavy metals: To the residue obtained in the test for Nonvolatile residue add 8 mL of 0.1 N hydrochloric acid, warm gently until solution is complete, dilute with water to 100 mL, and use 10 mL of the solution: the limit is 0.001%.
Limit of nonvolatile residue: Evaporate 20 g in a tared dish, and dry at 105 for 1 hour: the weight of the residue does not exceed 2.0 mg.
Readily oxidizable substances: Dissolve 15 g of sodium hydroxide in 50 mL of water, cool, add 6 mL of bromine, stirring to effect complete solution, and dilute with water to 2000 mL. Transfer 25.0 mL of this solution to a glass-stoppered, 250-mL conical flask containing 100 mL of water, and add 10 mL of sodium acetate solution (1 in 5) and 10.0 mL of Propionic Acid. Allow to stand for 15 minutes, add 5 mL of potassium iodide solution (1 in 4) and 10 mL of hydrochloric acid, and titrate with 0.1 N sodium thiosulfate VS just to the disappearance of the brown color. Perform a blank determination. The difference between the volume of 0.1 N sodium thiosulfate required for the blank and that required for the test specimen is not more than 2.2 mL.