Question

What are the spectator ions for:

CoCl2 +    FeCl3​

AgNO₃ +    CoCl₂ ​

Na2CO3 +   AgNO3 ​

CuSO4 +    Na2CO3 ​

CuSO₄ +    BaCl₂  ​

Na₃PO₄ +     CuSO4​

NiCl₂ +  Na₃PO₄ ​

Answer 1

1. Fe3+ + 1e-   Fe2 + .... +0.77V

Co2+   Co3 +1e- ........ -1.84V

The cell potential is negative, and therefore the reaction is nonspontaneous ,therefore no reaction occurs.

FeCl3(aq) +CoCl2 (aq) no reaction.

2. A precipitate of AgCl is formed

Equation

2AgNO3 (aq) + CoCl2(aq) 2AgCl(s) +CoNO3(aq)

Net ionic equation:

Ag+(aq) +Cl- (aq)   AgCl(s).

The other ions are spectator ions.

3.Balancing the molecular equation:

2AgNo3 (aq) + Na2CO3 (aq) Ag2CO3(s) +2NaNO3(aq)

2Ag +(aq) + 2NO#+(aq)+ 2Na +(aq) +CO3 2-(aq)   AgCO3(s) +2NO3-(aq) +2Na +(aq)

Delete everything that is identical on both sides of equation

In this case delete 2Na+ and 2NO3-

Net ionic equation is:

2Ag +(aq) +CO3 2- (aq) AgCO3.

The other ions are spectator ions (2Na+ and 2NO3-)

4.CuSO4 (aq) + Na2CO3 (aq)   CuCO3 (s) + Na2SO4 (aq)

Look at the balanced equation-particularly at the products .

What remains in the solution-only the Na2SO4 .

The participate CuCO3 cannot form ions .

So only the Na2SO4 can form ions.

you have Na+ and SO4 2- ions as reactants and as products .

So the Na+ and SO4 2- ions are spectator ions.

5. CuSO4 +BaCl2 BaSO4 (s) + CuCl2

The net ionic equation is

SO4 2-(aq) + Ba 2+(aq)   BaSO4 (s)

The other ions are spectator ions.

6.Na3PO4 +     CuSO4​

3Cu2+(aq) +2PO43-(aq)   Cu3 (PO4)2(s)

Therefore

Na+ and SO42- are spectator ions.

7.NiCl2 +  Na3PO4 ​

6Na + +2 PO43- + 3 NI2 + + 6Cl- Ni0(PO4)2 +6 Na +6Cl-

2 PO4 3- + 3 Ni 2+   Ni3(PO4)2.

The other ions are spectator ions.