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 Form 3 Chemistry Paper 1 Sample Revision Questions With Answers

During the manufacture of sodium carbonate by the the Solvay there is a by -product produced which is not recycled.
a).Write the equation for the formation of this by- product.
b).State one of the uses of the product (a) above.
c).State one use of the sodium carbonate formed.

 (2m 1s)
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Answer Text:
a).#Ca(OH)_(2(aq)) + 2NH_4Cl_(s) ->CaCl_(2(aq)) + 2NH_(3(g)) + 2H_2 O_(l)#
b).-Used to dry gases when anhydrous.
-Used in defrosting ice on roads in temperate countries.
c).-Used in manufacture of glass
-Used in softening hard water.