Benzoic Acid


MOLECULAR WEIGHT :- 122.12 g/mol

Description Colorless, light crystals, scales or needles, odour, slight characteristic. White or almost white, crystalline powder or colorless crystals. Colorless, light crystals, scales or needles, odor, slight characteristic.
Solubility Slightly soluble in water, soluble in boiling water and freely soluble in ethanol (96 %) and in fatty oils.
Appearance of solution


A 5.0 % w/v solution in ethanol (95%) is clear and colorless. 5 % solution in ethanol (96 %) is clear and colorless.

(A)   Melting point

(B)   Reaction

(C)   Acidic


A.   1210C to 1230C

B.   buff colored precipitate is produced

C.   Light absorption maximum at about 225 nm, about 0.8.

D.   1% w/v solution is acidic to methyl red solution.


A  : 1210C to 1240C

B: It gives reaction of Benzoates.


A.   Summoned colored PPT is formed.

B.   A white PPT formed which is soluble in ether




Arsenic     NMT 2 ppm.
Heavy metals    NMT10 ppm. NMT10 ppm.
Readily oxidisable  substance NMT 0.5 ml of potassium permanganate is require to persist pink color. After 5 min. solution is still colored pink. NMT 0.50 ml of 0.10 N potassium permanganate is Consumed.
Readily carbonisable  substance The color of the solution is not more instance than that of the reference solution YS5. The solution is not more intensely colored than reference solution Y5 The solution has no more color than matching fluid Q.
Cinnamic acid         No odour of benzaldehyde is developed.
Chlorinated compounds The filtrate compiles with the limit test of chloride.
Halogenated compounds & Halides NMT 300 ppm
Residue on Ignition NMT 0.1 % NMT 0.1 % NMT  0.05 %
Water by KF            NMT 0.7 % NMT 0.7 %
Assay (on anhydrous basis) 99.5 % to 100.5 % 99.0 % to 100.5 % 99.5 % to 100.5 %