[SPASH]

KI(aq) + F2(g)   ----->   I2 (s) + KF(aq)

I need to write a net ionic equation for the equation above.  I have balanced the equation below.

2KI(aq) + F2(g)   ----->   I2 (s) + 2KF(aq)

Can I simply cross out the spectator ion (2KF)?  I'm very confused on this equation.

I'm not sure how to hand the gas, especially because it does not combine to form a nonsoluble product.

Is the above reaction even possible?

[Borek]

Can I simply cross out the spectator ion (2KF)?

KF is not a spectator ion, its a salt. Write everything down in ionic form to check out what is a spectator.

Is the above reaction even possible?

Absolutely.

You don't have to do anything about the gas. It just reacts with the dissolved iodide anions.

[SPASH]

I was talking to someone else, and they said the net ionic equation is

2I- + F2 --> 2F- + I2

This differes from what you are telling me.  

1) 2K+(aq)+ 2I-(aq) + F2(g) ----->  I2(s) + 2K+(aq) + 2F-(aq)

2) 2KI(aq) + F2(g) ------>  I2 (s) + 2KF(aq)

3) 2K+(aq) + 2I-(aq) + 2F-(aq) -------->   I2(s) + 2K+(aq) + 2F-(aq)

4) 2I-(aq) + F2(g)  ------->  I2(s) + 2F-(aq)

These are the four options I was given. I know that i'm not supposed to ask for answers to chemistry problems, but I am recieving different answers from different people.  I seem to trust your responses the most.  Could you please give me a little more help.  I would greatly appreciate any more *delete me*

Thank you!!

[Donaldson Tan]

(1) & (3) are not the net ionic equations because u can eliminate K+ from both LHS & RHS.

(2) is not the net ionic equation because it contains the term KI(aq).

(4) fulfills all condition of being a net ionic equation. Moreover, it highlights that fluorine oxidises iodide to iodine.

[Borek]

I was talking to someone else, and they said the net ionic equation is

2I- + F2 --> 2F- + I2

and that's the correct answer.

This differes from what you are telling me.

No. I was pointing you into exactly the same direction.

Instead of writing KI on the left side of the equation write K⁺ and I^-. On the right side replace KF with K⁺ + F^-. That's because both salts - potassium iodide and potassium fluoride - are dissolved and dissociated. Now K⁺ cancels out - it is a spectator ion.

What is left is equation 4, as charco stated.