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Monday 17 August 2015

What is a spectator ion?

spectator ion is an ion that exists as both a reactant and a product in a chemical equation.
Consider the reaction
NaCl(aq)+AgNO3(aq)AgCl(s)+NaNO3(aq)
The ionic equation is:
Na+(aq)+Cl(aq)+Ag+(aq)+NO3(aq)AgCl(s)+Na+(aq)+NO3(aq)
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The Na+ and NO3 ions are spectator ions because they remain unchanged on both sides of the equation. They just "watch" the other ions react, hence the name.
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We usually cancel the spectator ions from each side of an ionic equation to form anet ionic equation:
Na(aq)+Cl(aq)+Ag+(aq)+NO(aq)AgCl(s)+Na(aq)+NO(aq)
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Cl(aq)+Ag+(aq)AgCl(s)
EXAMPLE:
Identify the spectator ions and write the net ionic equation for the reaction:
HCl(aq)+NaHCO3(aq)NaCl(aq)+H2O(l)+CO2(g)
SOLUTION:
Ionic Equation:
H+(aq)+Cl(aq)+Na+(aq)+HCO3(aq)Na+(aq)+Cl(aq)+H2O(l)+CO(g)
The spectator Ions are Cl and Na+.
Net Ionic Equation:
H+(aq)+Cl(aq)+Na(aq)+HCO3(aq)Na(aq)+Cl(aq)+H2O(l)+CO2(g)




https://www.youtube.com/watch?v=vbx5nfAiBlMH+
(aq)+HCO3(aq)H2O(l)+CO2(g)

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