CALCIUM SULFATE DIHYDRATE - (13397-24-5)

Introduction

Name: calcium sulfate dihydrate
* IUPAC
CAS Number: 13397-24-5
Chemical Formula: CaSO42H2O
Molar Mass: 154.15588 g
Mass Percent: Ca 25.998 %; S 20.800 %; O 41.514 %; H 1.3076 %; O 10.378 % 

Classification

• inorganic

Uses/Function

• "The dihydrate is used in the manuf[acture] of portland cement; in soil treatment to neutralized alkali carbonates and to prevent the loss of volatile and dissolved nitrogenous compounds by volatilization and leaching; for the manuf[acture] of plaster of Paris, artificial marble; as a white pigment, filler or glaze in paints, enamels, pharmaceuticals, paper, insecticide dusts, yeast manuf[acture], water treatment, polishing powders; in the manuf[acture] of sulfuric acid, CaC2, (NH4)2SO4, porous polymers. Pharmaceutic aid (in plaster casts)." 1

Bonding

Thermochemistry

ΔHf° (s): -483.42 kcal/mol 2 = -2,022.63 kJ/mol
S° (s): 46.4 cal/(mol•K) 3 = 194.14 J/(mol•K)
ΔGf° (s): -429.60 kcal/mol 4 = -1,797.45 kJ/mol

For More Information

Sources

(1) - The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals, 13th ed.; Budavari, S.; O'Neil, M.J.; Smith, A.; Heckelman, P. E.; Kinneary, J. F., Eds.; Merck & Co.: Whitehouse Station, NJ, 2001; entry 1711.
(2) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(3) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(4) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.