Melting point :251 °C (dec.) (lit.)
Boiling point :259.73°C (rough estimate)
Density :1.694
vapor pressure :0Pa at 25℃
refractive index :1.5690 (estimate)
storage temp. :2-8°C
solubility :Methanol (Slightly), Water (Slightly, Heated)
pka :4.41(at 25℃)
form :Powder
color :Off-white
PH :3.75(1 mM solution);3.22(10 mM solution);2.71(100 mM solution)
biological source :plant fruit
Water Solubility :12 g/L cold water
Merck :14,4345
BRN :2050274
Henry's Law Constant :1.2×10¹⁴ mol/(m³Pa) at 25℃, HSDB (2015)
Stability :Stability Stable, but may discolour upon exposure to light. Hygroscopic. Incompatible with strong oxidizing agents, strong bases, acid chlorides, acid anhydrides.
Major Application :agriculture
metabolomics
microbiology
vitamins, nutraceuticals, and natural products
vitamins, nutraceuticals, and natural products Cosmetics Ingredients Functions :ANTIOXIDANT
InChI :1S/C7H6O5/c8-4-1-3(7(11)12)2-5(9)6(4)10/h1-2,8-10H,(H,11,12)
InChIKey :LNTHITQWFMADLM-UHFFFAOYSA-N
SMILES :OC(=O)c1cc(O)c(O)c(O)c1
LogP :0.7
CAS DataBase Reference :149-91-7(CAS DataBase Reference)
NIST Chemistry Reference :Benzoic acid, 3,4,5-trihydroxy-(149-91-7)
EPA Substance Registry System :Gallic acid (149-91-7)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:	P302+P352 IF ON SKIN: wash with plenty of soap and water. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.