Assessment and Qualifications Alliance (AQA) GCSE Chemistry Paper 1 Practice Exam

Increasing the concentration of an electrolyte in a cell typically results in a higher voltage output. This occurs because a more concentrated electrolyte enhances the availability of ions that can participate in the electrochemical reactions taking place within the cell. When the concentration of ions is higher, it facilitates a more efficient flow of charge, effectively increasing the rate of the reactions at the electrodes.

As the concentration of the electrolyte rises, the increased number of ions allows for more effective movement of charge, which leads to a higher potential difference, or voltage. This principle aligns with the Nernst equation, which relates concentration to the cell potential, illustrating that an increase in concentration positively correlates with an increase in voltage. Thus, under typical conditions, raising the concentration of the electrolyte will improve the cell's efficiency and lead to higher voltage output.

A different concentration could lead to various effects, but in the context of this question, a higher concentration positively influences the voltage, confirming that the correct understanding is that increasing the electrolyte concentration increases the voltage.