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Magnesium Hydroxide BP USP FCC Food Grade Manufacturers Suppliers

Magnesium Hydroxide
BP USP FCC Food Grade
Magnesium hydroxide

Magnesium Hydroxide: CAS Number: 1309-42-8, Molecular Formula: Mg(OH)2, Molecular Weight: 58.32

Magnesium Hydroxide FCC Food Grade
Mg(OH)2 Formula wt 58.32
INS: 528 CAS: [1309-42-8]

Magnesium Hydroxide occurs as a white, bulky powder. It is soluble in dilute acids but practically insoluble in water and in alcohol.
Function: pH control; drying agent; color-retention agent.

Identification: A 1:20 aqueous solution in 2.7 N hydrochloric acid gives positive tests for.
Assay: Not less than 95.0% and not more than 100.5% of Mg(OH)2 after drying.
Alkalies (Free) and Soluble Salts: Passes test.
Calcium Oxide: Not more than 1%.
Lead: Not more than 2 mg/kg.
Loss on Drying: Not more than 2.0%.
Loss on Ignition: Between 30.0% and 33.0%.

Magnesium Hydroxide BP

Content: 95.0 per cent to 100.5 per cent of Mg(OH)2.

Appearance: White, fine, amorphous powder.
Solubility: Practically insoluble in water. It dissolves in dilute acids.

A. Dissolve about 15 mg in 2 ml of dilute nitric acid and neutralize with dilute sodium hydroxide solution. The solution gives the reaction of magnesium.
B. It complies with the test for loss on ignition (see Tests).

Solution S: Dissolve 5.0 g in a mixture of 50 ml of acetic acid and 50 ml of distilled water.  Not more than slight effervescence is produced. Boil for 2 min, cool and dilute to 100 ml with dilute acetic acid. Filter, if necessary, through a previously ignited and tarred porcelain or silica filter crucible of suitable porosity to give a clear filtrate.
Appearance of solution: Solution S is not more intensely coloured than reference solution.
Soluble substances: Maximum 2.0 per cent.
Substances insoluble in acetic acid: Maximum 0.1 per cent.
Chlorides: Maximum 0.1 per cent.
Sulphates: Maximum 0.5 per cent.
0.6 ml of solution S diluted to 15 ml with distilled water complies with the limit test for sulphates.
Arsenic: Maximum 4 ppm.
Calcium: Maximum 1.5 per cent.
Iron: Maximum 0.07 per cent.
Heavy metals: Maximum 30 ppm.
Loss on ignition: 29.0 per cent to 32.5 per cent. Heat 0.5 g gradually to 900°C and ignite to constant mass.

Magnesium Hydroxide USP
Mg(OH)2 58.32 --- [1309-42-8].

Magnesium Hydroxide, dried at 105 for 2 hours, contains not less than 95.0 percent and not more than 100.5 percent of Mg(OH)2.

Identification: A 1 in 20 solution in 3 N hydrochloric acid responds to the tests for Magnesium.
Microbial limits: It meets the requirements of the test for absence of Escherichia coli.
Loss on drying: Dry it at 105 for 2 hours: it loses not more than 2.0% of its weight.
Loss on ignition: Ignite it at 800 , increasing the heat gradually, to constant weight: it loses between 30.0% and 33.0% of its weight.
Soluble salts: Boil 2.0 g with 100 mL of water for 5 minutes in a covered beaker, filter while hot, cool, and dilute the filtrate with water to 100 mL. Titrate 50 mL of the diluted filtrate with 0.10 N sulfuric acid, using methyl red TS as the indicator: not more than 2.0 mL of the acid is consumed.
Evaporate 25 mL of the diluted filtrate to dryness, and dry at 105 for 3 hours: not more than 10 mg of residue remains.
Carbonate: Boil a mixture of 0.10 g with 5 mL of water, cool, and add 5 mL of 6 N acetic acid: not more than a slight effervescence is observed.
Limit of calcium: the limit is 1.5%.
Heavy metals: the limit is 20 <g per g.
Lead: limit is 0.001%.

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Copyright Last 4 December, 2017

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