Chemical and Ionic Equilibrium - Result Question 25
####25. An example of a reversible reaction is
$(1985,1 M)$
(a) $Pb\left(NO _3\right) _2(a q)+2 NaI(a q)=PbI _2(s)+2 NaNO _3(a q)$
(b) $AgNO _3(a q)+HCl(a q)=AgCl(s)+HNO _3(a q)$
(c) $2 Na(s)+2 H _2 O(l)=2 NaOH(a q)+H _2(g)$
(d) $KNO _3(a q)+NaCl(a q)=KCl(a q)+NaNO _3(a q)$
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Solution:
- In reactions (a), (b) and (c), atleast one of the product is either insoluble precipitate or a gas that drive the reaction continuously to right and do not allow equilibrium to be established. Following is the reversible reaction.
$$ KNO _3(a q)+NaCl(a q) \rightleftharpoons KCl(a q)+NaNO _3(a q) $$
