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Sodium sulphate is used in production of Sodium lauryl sulphate. Sodium lauryl sulphate is a surfactant and is used in manufacturing of dirt removing substances such as detergent, soaps shampoos etc.
Sodium sulphate and sodium chloride combined should not exceed 8% v/v to have premier quality surfactant
Surfactants are those chemicals which alters the surface energy of the substance to which it is added which results in changes in the physical property of the targeted substance. For example the dirt or oil on clothes when immersed in plain cold water , doesn't get detached easily because the surface energy of the dirt is neutral such that it remains on the surface of the cloth rather than getting dispersed into cold plain water.
When detergent is added, the surfactant provides the surface energy to the dirt thus, enabling it move from the surface of the cloth to the surrounding water.
The surfactants has two ends one water loving end and water repelling end, which is called as hydrophilic head and hydrophobic tail. The hydrophobic tail attaches to the oil/dirt and forms a micelle.
In this blog we are going to read about the method of testing of Sodium sulphate anhydrous in the surfactant preparation.
As stated earlier Sodium sulphate and sodium chloride combined should not exceed 8% v/v.
- About 1g of Sodium Lauryl Sulphate has to be transferred in 10 mL of water.
- 100 mL of alcohol has to be added and heated up at to the temperature just below the boiling point for 2 hours
- The residue has to be filtered through a glass filter while hot and has to be washed with 100mL of boiling alcohol.
- The filtered precipitate has to be dissolved by washing it with 150 mL of water.
- The washings is then collected in the beaker.
- 10 mL of dilute HCl has to be added and is then heated till it starts boiling.
- 25 mL of barium chloride solution is added and allowed to stand overnight
- The precipitate is collected and washed with water until the washing shows no opalescence with 0.1N Silver Nitrate.
- The precipitate is dried and ignited to constant mass between 500 to 600 degrees by raising the temperature gradually.
Amount of Sodium Sulphate = 0.6086 * Weight of Barium sulphate (the weight of precipitate)
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