Consider the reaction: 3Co 2+ ( aq ) + 6NO 3 - ( aq ) + 6Na + ( aq ) + 2PO 4 3-
ID: 965477 • Letter: C
Question
Consider the reaction:
3Co2+(aq) + 6NO3-(aq) + 6Na+(aq) + 2PO43-(aq) Co3(PO4)2(s) + 6Na+(aq) + 6NO3-(aq)
Identify the net ionic equation for this reaction.
Answer choices:
Na+(aq) + NO3-(aq) NaNO3(aq)
3Co2+(aq) + NO3-(aq) + Na+(aq) + 2PO43-(aq) Co3(PO4)2(s) + NaNO3(aq)
3Co2+(aq) + 6NO3-(aq) + 6Na+(aq) + 2PO43-(aq) Co3(PO4)2(s) + 6NaNO3(aq)
3Co2+(aq) + 2PO43-(aq) Co3(PO4)2(s)
None of the above is the correct net ionic equation.
Na+(aq) + NO3-(aq) NaNO3(aq)
3Co2+(aq) + NO3-(aq) + Na+(aq) + 2PO43-(aq) Co3(PO4)2(s) + NaNO3(aq)
3Co2+(aq) + 6NO3-(aq) + 6Na+(aq) + 2PO43-(aq) Co3(PO4)2(s) + 6NaNO3(aq)
3Co2+(aq) + 2PO43-(aq) Co3(PO4)2(s)
None of the above is the correct net ionic equation.
Explanation / Answer
Net ionic contains only thos ions reacted (i.e. those of solid)
then
3Co2+(aq) + 6NO3-(aq) + 6Na+(aq) + 2PO43-(aq) Co3(PO4)2(s) + 6Na+(aq) + 6NO3-(aq)
marked in bold, those are spectator ions
then
net ionionc
3Co2+(aq) + 2PO43-(aq) Co3(PO4)2(s)