Here's why:
* Ions are atoms or molecules that have gained or lost electrons, giving them a net electrical charge.
* Current flow is the movement of electrical charge.
* In a solution, ions are free to move around. When a voltage is applied, the positively charged ions (cations) move towards the negative electrode, and the negatively charged ions (anions) move towards the positive electrode. This movement of ions constitutes the electrical current.
Let me know if you'd like more details about ions or electrical conductivity in solutions!
