Which of the following best describes the mobility of ions in relation to conductivity?

The correct choice emphasizes that the mobility of ions is fundamentally linked to conductivity. In ionic solutions, conductivity is primarily reliant on the movement of charged particles (ions). When an electric potential is applied, these ions migrate toward respective electrodes, enabling the flow of current. The higher the mobility of the ions, the more readily they can move through the solution, thus increasing the conductivity. Factors such as the size, charge, and type of ions present significantly affect their mobility.

While other options mention certain aspects of conductivity, they do not accurately capture the central role that ion mobility plays. For instance, it is incorrect to state that ion mobility has no impact on conductivity, as this directly contradicts the principles of electrochemistry. Additionally, stating that it decreases conductivity overlooks how more mobile ions can enhance conduction. Lastly, saying that ion mobility only impacts conductivity at high temperatures is misleading, as ion mobility affects conductivity across various temperature ranges, although temperature can influence how well ions move.