Page 4 - Microsoft Word - Module-2

NH HCO + NaCl NH Cl + NaHCO 3
4
3
4
2NaHCO 3 NaHCO + CO + H O
2
2
3
K2CO cannot be prepared by Solvay process
3
because KHCO is highly soluble and cannot
3
precipitated.

Properties:

 It is white crystalline solid and soluble in water.

 It loses water of crystallization to form

monohydrate.

 Above 373K we get anhydrous Na CO (white
2
3
powder) called soda ash.

ଷ଻ଷ௄
Na CO . 10H O Na CO H O + 9H O
3
2
2
2
3. 2
2
வଷ଻ଷ௄
Na CO H O Na CO + H
2
3
2
2
3. 2
Uses:
 It is used in glass, soap, paper and glass industry.
 Important laboratory reagent.

(b)Sodium chloride:

Preparation:

Pure NaCl is obtained by dissolving crude salt in

minimum amount of water and filtered to remove

insoluble impurities. The solution is then saturated