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Sodium Metasilicate Pentahydrate Nonahydrate Anhydrous FCC Food Grade Supplier Exporter Manufacturers' Representative |
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Sodium Metasilicate
CAS Number:
6834-92-0 Anhydrous
10213-79-3 Pentahydrate
13517-24-3 Nonahydrate
Molecular Formula: Na2O-SiO2 for Anhydrous
Molecular Weight: 122.06
Sodium Metasilicate
Sodium metasilicate has formula Na2SiO3. It is hygroscopic. It generally come as a pentahydrate Na2O-SiO2-5H2O or as a nonahydrate Na2O-SiO2-9H2O.
Sodium Metasilicate FCC Food Grade Specifications:
Na2O-SiO2-xH2O Formula weight, anhydrous 122.06
INS: 550 CAS 6834-92-0
DESCRIPTION
Sodium Metasilicate occurs as a white, free-flowing, granular material. It is a hydrous (pentahydrate) or anhydrous silicate having a 1:1 molar ratio of SiO2 to Na2O. At 30°, the anhydrous Sodium Metasilicate is easily soluble in water (270 g/L) as is its pentahydrate (610 g/L). The pH values of 1% solutions of anhydrous Sodium Metasilicate and of its pentahydrate are about 12.6 and 12.4, respectively.
Function: Saponifying agent; boiler water additive.
REQUIREMENTS
Caution: Sodium Metasilicate and its solutions are caustic materials and can cause eye and skin burns. Use proper protective equipment and avoid contact with the eyes, skin, and clothing. Do not inhale vapors from Sodium Metasilicate solutions.
Labeling: Indicate the percent, each, of SiO2 and Na2O, and whether it is anhydrous or the pentahydrate.
Identification:
A. Dissolve about 200 mg of sample in 10 mL of water. Place a drop of this solution on a spot plate. Add 1 drop of 4 M sodium hydroxide and 1 drop of a solution prepared by dissolving 0.5 g of ammonium molybdate in 10 mL of water, followed by the addition of 3 mL of sulfuric acid. A deep yellow color indicates the presence of silicate.
B. Dip a clean nichrome wire into the final solution prepared in Identification Test A and place the wire in the flame of a Bunsen burner. A bright yellow color indicates the presence of sodium.
Assay: for Silicon Dioxide and Sodium Oxide Not less than 90.0% and not more than 110.0% of the percents claimed on the label.
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