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CBSE Class 10 Answered

Formation of few compounds
Asked by | 17 Aug, 2011, 03:38: AM
answered-by-expert Expert Answer
a) formation of sodium hydroxide:
Na(s) + H2O(l) ? NaOH (aq)+  H2(g)
b] Baking Soda: NaHCO3
NaHCO3 is mainly prepared by the Solvay process,
the reaction is carried out by passing concentrated brine through carbon dioxide bubbles up through the ammoniated brine, and sodium bicarbonate (NaHCO3) precipitates out of the solution
NaCl + CO2 + NH3 + H2O ? NaHCO3 + NH4Cl (I)
 
c] Gypsum:
on mixing watre to plaster of paris we get gypsum
CaSO4.1/2 H2O + 1.1/2H2O ? CaSO4.2H2O
                                               (gypsum)
d] Bleaching Powder:

It is manufactured by the calcium process:

2 Ca(OH)2 + 2 Cl2 ? Ca(ClO)2 + CaCl2 + 2 H2O
Bleaching powder is actually a mixture of calcium hypochlorite (Ca(ClO)2) and the basic chloride CaCl2, H2O with some slaked lime, Ca(OH)2.
e] Washing soda:Na2CO3
The Solvay process results in soda ash  from brine  and from limestone
The overall process is:
2 NaCl + CaCO3 ? Na2CO3 + CaCl2
Answered by | 17 Aug, 2011, 03:19: PM

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