Explanation
Firstly, we need to write down the balanced chemical equation
![KF+NH_4NO_3\text{ }\rightarrow KNO_3+NH_4F](https://img.qammunity.org/2023/formulas/chemistry/college/663aeit3l44jdgusgaytmvwricbf6gfr15.png)
The next step is to write the state of each substance
![KF_((aq))+NH_4NO_(3(aq))\rightarrow KNO_(3(aq))+NH_4F_((aq))](https://img.qammunity.org/2023/formulas/chemistry/college/youxiurd3z6qgm8drwr0ua2uznypr3uku3.png)
The next step is to split strong electrolytes into ion
![K^++F^-+NH^+_{4^{}}+NO^-_3\rightarrow K^++NO^-_3+NH^+_4+F^-^{}](https://img.qammunity.org/2023/formulas/chemistry/college/ucicglx9hmf07xcpkh0zqqp80lkd8bpvjs.png)
The next step is to cross out the spectator ions on both sides of the complete ionic equation
From the complete ionic equation above, you will see that K^+ appears on both sides,