Topic salts- common salt

Acids, bases and salts - common salts

1. TOPIC- COMMON SALT By: Mrs RITIMA MANHAS

2. CHEMICAL NAME AND FORMULA CHEMICAL FORMULA- NaCl CHEMICAL NAME- SODIUM CHLORIDE

3. OCCURRENCE AND EXTRACTION OF COMMON SALT Sea water Rock salt Inland lakes

4. PROPERTIES OF COMMON SALT I t is colorless crystalline substance with melting point 820°C. It is slightly hygroscopic in nature that is takes up moisture from air and becomes wet. This is due to presence of magnesium and calcium chloride in it. On heating with concentrated sulphuric acid it gives out fumes of HCl. At low temperature it exist as dihydride . On heating a crackling sound is produced due to breaking up of crystals.

5. USES Essential constituent if our diet. Used as preservative for packing food material. Mixes with ice , it is used to make freezing mixture. It has number of industrial applications : a. In manufacture of soap, for salting out. b. In preparation of pottery glaze. • A raw material for production of other chemicals like baking soda , washing soda, caustic soda, chlorine , sodium, bleaching powder.