Phosphoric Acid

Phosphoric acid (also known as orthophosphoric acid H3PO4) is a non-toxic acid. In addition to being a chemical reagent, phosphoric acid has a wide variety of uses, including as a rust inhibitor, food additive, dental and orthop(a)edic etchant, electrolyte, flux, dispersing agent, industrial etchant, fertilizer feedstock, and component of home cleaning products. Phosphoric acids is also important in biology. The most common source of phosphoric acid is an 85% aqueous solution; such solutions are colourless, odourless, and non-volatile. The 85% solution is a syrupy liquid, but still pourable.

We offer all grades of Phosphoric Acid including 0.1 N or 1N (Normal), 0.1 N or 1N (Normal) or 0.1 & 1M (Molar) etc Analytical Reagent (Normal) or 0.1 & 1M (Molar) etc Analytical Reagent Grade products.

Phosphoric Acid USP NF Grade:
H3PO4 --- 98.00
Phosphoric acid --- CAS 7664-38-2.
Phosphoric Acid contains not less than 85.0 percent and not more than 88.0 percent, by weight, of H3PO4.
Caution: Avoid contact, as Phosphoric Acid rapidly destroys tissues.

Identification: When carefully neutralized with 1 N sodium hydroxide, phenolphthalein being used as the indicator, it responds to the tests for Phosphate.
Sulfate: Dilute 6 mL of Phosphoric Acid with 90 mL of water, and add 1 mL of barium chloride: no precipitate is formed immediately.
Heavy metals: 0.001%.
Alkali phosphates: Transfer 1 mL of it to a graduated cylinder, and add 6 mL of ether and 2 mL of alcohol: no turbidity is produced.
Limit of nitrate: Dilute 6 mL of Phosphoric Acid with 14 mL of water, mix 5 mL of the dilution with about 0.1 mL of indigo carmine, then add 5 mL of sulfuric acid: the blue color is not discharged within 1 minute.
Phosphorous or hypophosphorous acid: Dilute 6 mL of Phosphoric Acid with 14 mL of water. Gently warm 5 mL of the dilution and add 2 mL of silver nitrate: the mixture does not become brownish.
Assay: Weigh accurately about 1 g of Phosphoric Acid in a tared, glass-stoppered flask, and dilute it with water to about 120 mL. Add 0.5 mL of thymolphthalein and titrate with 1 N sodium hydroxide to the first appearance of a blue color. Perform a blank determination and make any necessary correction. Each mL of 1 N sodium hydroxide is equivalent to 49.00 mg of H3PO4.

Phosphoric Acid BP Grade
Concentrated Phosphoric Acid, Ph Eur
H3PO4 -- 98.0 -- CAS 7664-38-2

DEFINITION
Content: 84.0 per cent m/m to 90.0 per cent m/m.

CHARACTERS
Appearance: Clear, colourless, syrupy liquid, corrosive.
Solubility: Miscible with water and with ethanol (96 per cent). When stored at a low temperature it may solidify into a mass of colourless crystals which do not melt at a temperature below 28C.
Relative density: About 1.7.

IDENTIFICATION
A. Dilute with water. The solution is strongly acid.
B. Solution S (see Tests) neutralised with dilute sodium hydroxide solution gives the reactions of phosphates.

TESTS
Solution S: Dilute 10.0 g to 150 ml with water R.
Appearance of solution: Solution S is clear and colourless.
Substances precipitated with ammonia: To 10 ml of solution S add 8 ml of dilute ammonia. Any opalescence in the solution is not more intense than that in a mixture of 10 ml of solution S and 8 ml of water.
Hypophosphorous acid and phosphorous acid: To 5 ml of solution S add 2 ml of silver nitrate solution and heat on a water-bath for 5 min. The solution shows no change in appearance.
Chlorides: Maximum 50 ppm, determined on solution S.
Sulphates: Maximum 100 ppm.
Arsenic: Maximum 2 ppm, determined on 7.5 ml of solution S.
Iron: Maximum 50 ppm.
Heavy metals: Maximum 10 ppm.

ASSAY
To 1.000 g add a solution of 10 g of sodium chloride in 30 ml of water. Titrate with 1 M sodium hydroxide, using phenolphthalein solution as indicator. 1 ml of 1 M sodium hydroxide is equivalent to 49.00 mg of H3PO4.

Phosphoric Acid FCC Food Grade
Orthophosphoric Acid
H3PO4 Formula weight 98.00
INS: 338 CAS 7664-38-2

DESCRIPTION
Phosphoric Acid occurs as a colorless, aqueous solution, usually available in concentrations ranging from 75.0% to 85.0%. It is miscible with water and with alcohol.
Function: Acidifier; sequestrant.

REQUIREMENTS
Labeling: Indicate the percent, or the percent range, of Phosphoric Acid (H3PO4).
Identification: A 1:10 aqueous solution gives positive tests for Phosphate.
Assay: Not less than the minimum or within the range of percentage claimed by the vendor.
Arsenic: Not more than 3 mg/kg.
Cadmium: Not more than 3 mg/kg.
Fluoride: Not more than 10 mg/kg.
Lead: Not more than 3 mg/kg.

Phosphoric Acid Analytical Reagent Grade
Orthophosphoric Acid
Phosphoric(V) Acid
H3PO4
Formula Weight 98.00 CAS Number 7664-38-2

REQUIREMENTS
Assay: >85.0% H3PO4
Color (APHA): 10
Insoluble matter: 0.001%
Chloride (Cl): 3 ppm
Nitrate (NO3): 5 ppm
Sulfate (SO4): 0.003%
Volatile acids (as CH3COOH): 0.001%
Antimony (Sb): 0.002%
Calcium: 0.002%
Magnesium: 0.002%
Potassium (K): 0.005%
Sodium (Na): 0.025%
Arsenic (As): 1 ppm
Heavy metals (as Pb): 0.001%
Iron (Fe): 0.003%
Manganese (Mn): 0.5 ppm
Reducing substances: Passes test.

Phosphoric Acid, Ultratrace Analytical Reagent Grade:
(suitable for use in ultratrace elemental analysis)
H3PO4 --- Formula Weight 98.00
CAS Number 7664-38-2

NOTE. Reagent must be packaged in a preleached Teflon bottle and used in a clean environment to maintain purity.

REQUIREMENTS
Appearance: Clear
Assay: 85.0% H3PO4

MAXIMUM ALLOWABLE
Chloride (Cl): 3 ppm
Nitrate (NO3): 5 ppm
Sulfate (SO4): 0.003%
Aluminum (Al): 50 ppb
Barium (Ba): 5 ppb
Boron (B): 5 ppb
Cadmium (Cd): 5 ppb
Calcium (Ca): 50 ppb
Chromium (Cr): 5 ppb
Cobalt (Co): 10 ppb
Copper (Cu): 5 ppb
Iron (Fe): 20 ppb
Lead (Pb): 10 ppb
Lithium (Li): 5 ppb
Magnesium (Mg): 10 ppb
Manganese (Mn): 5 ppb
Molybdenum (Mo): 5 ppb
Mercury (Hg): 5 ppb
Potassium (K): 5 ppb
Sodium (Na): 50 ppb
Strontium (Sr): 5 ppb
Tin (Sn): 10 ppb
Titanium (Ti): 5 ppb
Vanadium (V): 5 ppb
Zinc (Zn): 50 ppb
Zirconium (Zr): 5 ppb.

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