Lead nitrate solution treated with calcium chloride solution and … - Vidyadip

Question

Lead nitrate solution treated with calcium chloride solution and products are heated and cooled.

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Answer

When lead nitrate solution is treated with calcium chloride solution it forms white ppt. of lead chloride and calcium nitrate
$CaCl _{2( s )} \rightarrow Ca ^{2+}{ }_{( aq )}+ Cl _{( aq )} $
$Pb \left( NO _3\right)_2( aq ) \longrightarrow Pb ^{2+}( aq )+ NO _3^{2-}( aq ) $
$Pb ^{2+}( aq )+ NO _3^{2-}( aq )+ Ca ^{2+}( aq )+ Cl ^{-}( aq ) \longrightarrow PbCl _2+ Ca \left( NO _3\right)_2$
On further heating and cooling the products, calcium nitrate decomposes upon heating to release nitrogen dioxide:
$2 Ca \left( NO _3\right)_2 \rightarrow 2 CaO +4 NO _2+ O _2$

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