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1. Sodium Sulfate:
Sodium sulfate is the inorganic compound with formula Na2SO4 as well as several related hydrates. All forms are white solids that are highly soluble in water. Sodium sulfate can be obtained directly from the minerals or from the treatment of sodium chloride with sulfuric acid and evaporating to crystallization. It is also produce industrially by the reaction of magnesium sulfate and sodium chloride in solution followed by crystallization. Sodium sulfate is neutral and does not hydrolyse in water. The solubility of sodium sulfate increases sharply with temperature and achieve maximum solubility at around 33°C and decreases slowly beyond this temperature. It is also used in the manufacture of glass, paper pulp, paper board, and as a raw material for the production of various chemicals. Sodium sulfate is also used as a filler and extender in dry powder, laundary and dishwashing detergent products. In textile industry, the anhydrous salt is added to the dyebath to drive the dye from the solution onto the fibres and to promote an even finish.