Balancing Chemical Equations by Partial Equation Method
Consider the ...
Question
Consider the following equilibrium:
AgCl↓+2NH3⇌[Ag(NH3)2]++Cl−Soluble
White ppt. of AgCl appears on adding?
A
NH3
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B
aq.NaBr
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C
aq.HNO3
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D
aq.NH4I
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Solution
The correct option is Caq.HNO3
2HNO3 + [Ag(NH3)2]+ +Cl−→AgCl+2NH4 +2NO−3
When nitric acid is added to amine solution, solution is made acidic and the complex ion dissociates and liberate silver ion to recombine with chloride ion. This is the conformatory test for silver in group 1.
AgCl↓+2NH3⇌[Ag(NH3)2]++Cl−Soluble
Dilute nitric acid or hydrochloric acid neutralizes the excess ammonia and the precipitate reappears because the equilibrium is shifted backwards.