Chemistry, asked by SnakeByte7701, 1 year ago

Why do we measure the magnesium content in talcum powder?

Answers

Answered by pawanism67
0

A mineral which occurs naturally throughout the world. It has a platy structure. Talc is a metamorphic mineral resulting from the metamorphism of magnesian minerals such as serpentine, pyroxene, amphibole, olivine, in the presence of carbon dioxide and water. This is known as talc carbonation or steatization and produces a suite of rocks known as talc carbonates.

Talc is primarily formed via hydration and carbonation of serpentine, via the following reaction;

serpentine + carbon dioxide = talc + magnesite + water

Mg3Si2O5 (OH)4 + 3CO2 ? Mg3Si4O10 (OH)2 + 3 MgCO3 + 3 H2O

Talc can also be formed via a reaction between dolomite and silica, which is typical of skarnification of dolomites via silica-flooding in contact metamorphic aureoles, i.e.,

dolomite + silica + water = talc + calcite + carbon dioxide

CaMg(CO3)2 + 4 SiO2 + H2O = Mg3Si4O10 (OH)2 + 3 CaCO3 + 3 CO2

Synonyms

Hydrous magnesium silicate, (Mg3H2(SiO3)4), talc powder, cosmetic talc, french talc, montana talc, texas talc, vermont talc, industrial talc, tremolitic talc, steatite talc, fibrous non-tremolite talc, no asbestos talc, magnesium silicate talc, talcum, french chalk, soapstone, steatite, CAS# 14807-96-6,

Chemical Properties

Silicon dioxide= 56.3% magnesium ore) Finely ground grades oxide= 30.7% and calcium oxide= 7.0%

Physical Properties

a) Ceramic grade (Coarse, medium & fine)

b) Cosmetic grade

c) Paint grades

d) USP grade

e) Soapstone grade

f) Micronized grade

g) Finely ground grade

Targets, tablets, pieces, granules and various powder granulations sized between 37 microns to 1.5 microns mean particle size

Typical Applications

a) Lubricant, filler, reinforcement, electric and heat insulator, anti stick, anti cake, carrier, thickener, adsorbent, strengthener, ceramics, cosmetics, and pharmaceuticals.

b) Ground talc makes talcum powder. The massive variety (soapstone) is used for sinks, table tops, etc. Soapstone found a use in Babylonian days when signature cylinder seals were often carved from it.

c) The Egyptians also used it as a base for some of their blue faience figurines, which were then fired to fuse the glaze. California Indians also used it as sculpture material.

Packaging

Bags, drums and bulk bags

Specifications

Hegman Grind= 3- 6

Density (g/cm3)= 2.7- 2.85

Specific Gravity= 2.6- 2.85

Oil Absorption= 30-55

RI Values na=1.538 - 1.550 nß=1.575 - 1.594 n?=1.575 - 1.600

Appearance= Translucent, Colorless, White, Pale green, Brown

Surface Area= (m2/g) 4.3

Fracture= Sub-Conchoidal

Mohs Hardness= @20°C 1.0- 1.5

pH= 8.4-9.4

Crystallography= Lamellar / Triclinic

G.E. Brightness= 85- 93

Refractive Index= 1.59- 1.60

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