2,5-Dihydroxybenzoic acid 490-79-9 CAS NO.490-79-9

2,5-dihydroxybenzoic acid
【synonyms】

2,5-dihydroxybenzoic acid
2,5-dioxybenzoic acid
3,6-dihydroxybenzoic acid
5-hydroxysalicylic acid
carboxyhydroquinone
hydroquinonecarboxylic acid
【cas】

490-79-9
【formula】

c7h6o4
【molecular weight】

154.12
【einecs】

207-718-5
【rtecs】

ly3850000
【rtecs class】

mutagen; reproductive effector; natural product
【merck】

13,4409
【beilstein/gmelin】

2209119
【beilstein reference】

4-10-00-01441
physical and chemical properties back to contents
【appearance】

white powder.
【solubility in water】

very soluble
【melting point】

202 - 206
【boiling point】

339
【density】

1.55 g/cm3
【pka/pkb】

3.01 (pka)
【partition coefficient】

.81
【usage】

used as a sample matrix in matrix-assisted laser desorption/ionization mass spectrometry.
first aid measures back to contents
【ingestion】

never give anything by mouth to an unconscious person. get medical aid. do not induce vomiting. if conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
【inhalation】

remove from exposure to fresh air immediately. if not breathing, give artificial respiration. if breathing is difficult, give oxygen. get medical aid. do not use mouth-to-mouth respiration.
【skin】

get medical aid. flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. wash clothing before reuse.
【eyes】

flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. get medical aid.
handling and storage back to contents
【storage】

store in a tightly closed container. store in a cool, dry, well-ventilated area away from incompatible substances.
【handling】

wash thoroughly after handling. remove contaminated clothing and wash before reuse. use with adequate ventilation. minimize dust generation and accumulation. avoid contact with eyes, skin, and clothing. keep container tightly closed. avoid ingestion and inhalation.
hazards identification back to contents
【inhalation】

causes respiratory tract irritation. the toxicological properties of this substance have not been fully investigated. can produce delayed pulmonary edema.
【skin】

causes skin irritation.
【eyes】

causes eye irritation. may cause chemical conjunctivitis.
【ingestion】

may cause gastrointestinal irritation with nausea, vomiting and diarrhea. the toxicological properties of this substance have not been fully investigated.
【ec risk phrase】

r 36/37/38
【ec safety phrase】

s 26 36
exposure controls/personal protection back to contents
【personal protection】

eyes: wear appropriate protective eyeglasses or chemical safety goggles as described by osha's eye and face protection regulations in 29 cfr 1910.133 or european standard en166. skin: wear appropriate protective gloves to prevent skin exposure. clothing: wear appropriate protective clothing to prevent skin exposure.
【respirators】

a respiratory protection program that meets osha's 29 cfr 1910.134 and ansi z88.2 requirements or european standard en 149 must be followed whenever workplace conditions warrant a respirator's use.
【exposure effects】

effects may be delayed.
【poison class】

4
fire fighting measures back to contents
【fire fighting】

wear a self-contained breathing apparatus in pressure-demand, msha/niosh (approved or equivalent), and full protective gear. during a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. extinguishing media: use agent most appropriate to extinguish fire. in case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
accidental release measures back to contents
【small spills/leaks】

clean up spills immediately, using the appropriate protective equipment. sweep up, then place into a suitable container for disposal. avoid generating dusty conditions. provide ventilation.
stability and reactivity back to contents
【incompatibilities】

oxidizing agents.
【stability】

stable at room temperature in closed containers under normal storage and handling conditions.
【decomposition】

carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.
transport information back to contents
【hs code】

2918 29 90