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10049-21-5

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Identification

Name
PHOSPHATE BUFFER
CAS
10049-21-5
Synonyms
BOD PHOSPHATE BUFFER SOLUTION A
BUFFER COLOUR CODED CONCENTRATED SOLUTION PH 7 (PHOSPHATE) YELLOW
BUFFER COLOUR CODED SOLUTION PH 7 (PHOSPHATE) YELLOW
BUFFER CONCENTRATE, PH 7 (PHOSPHATE)
BUFFER FOR BOD
BUFFER MDB 9.50
BUFFER PH 7.0 (PHOSPHATE)
BUFFER, PHOSPHATE
BUFFER, PHOSPHATE PH 6.8
BUFFER (PHOSPHATE), PH 7
BUFFER, PHOSPHATE PH 7.0
BUFFER, PHOSPHATE, PH 7.00
BUFFER PHOSPHATE, PH 7.20
BUFFER PHOSPHATE, PH 7.40
BUFFER SOLUTION PH 6 (PHOSPHATE)
BUFFER SOLUTION, PH 7.00 +/-0.02, YELLOW
BUFFER SOLUTION PH 7 (PHOSPHATE)
BUFFER SOLUTION, PHOSPHATE
BUFFER SOLUTION (PHOSPHATE), PH 7
BUFFER SOLUTION (PHOSPHATE), PH 7.20
EINECS(EC#)
231-449-2
Molecular Formula
H4NaO5P
MDL Number
MFCD00081857
Molecular Weight
137.992
MOL File
10049-21-5.mol

Chemical Properties

Appearance
white semi-transparent crystals or crystalline
mp 
100°C-H₂O
density 
2,04 g/cm3
solubility 
H2O: 1 M, clear, colorless

Sensitive 
Hygroscopic
Merck 
14,8660
Uses
Excipient.
CAS DataBase Reference
10049-21-5(CAS DataBase Reference)
EPA Substance Registry System
10049-21-5(EPA Substance)

Safety Data

Hazard Codes 
Xi
Risk Statements 
R36/37/38:Irritating to eyes, respiratory system and skin .
R36:Irritating to the eyes.
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S36:Wear suitable protective clothing .
S39:Wear eye/face protection .
WGK Germany 
1

RTECS 
WA1900000

3
HS Code 
28352200

Questions and Answers (Q&A)

Chemical Properties
Anhydrous salt: white crystalline powder; slightly hygroscopic; forms sodium acid pyrophosphate, Na2H2P2O7 on heating above 225°C and sodium metaphosphate (NaPO3)n at about 350 to 400°C; very soluble in water, aqueous solution acidic.
Monohydrate: white orthorhombic crystals or granules; density 2.04 g/cm3 ; loses its water of crystallization at 100°C; very soluble in water, pH of 1% solution 4.5; insoluble in alcohol.
Dihydrate: large transparent crystals; orthorhombic bisphenoidal structure; density 1.915 g/cm 3 ; decomposes at 60°C; very soluble in water; insoluble in alcohol.
Preparation
Monobasic sodium phosphate can be prepared by partial neutralization of phosphoric acid with sodium hydroxide in equimolar amounts:
H3PO4+ NaOH →NaH2PO4+ H2O
It also can be made by treating disodium hydrogen phosphate with phosphoric acid in proper stoichiometric amount:
Na2HPO4+ H3PO4→2NaH2PO4

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