Ion concentration refers to the amount of charged particles, or ions, present in a solution. Ions can be positively charged, known as cations, or negatively charged, called anions. The concentration of these ions is crucial in various fields, including chemistry, biology, and environmental science, as it affects chemical reactions, biological processes, and the overall properties of the solution. In biological systems, ion concentration plays a vital role in processes such as nerve signaling and muscle contraction. For example, the balance of sodium and potassium ions is essential for maintaining cell function. Monitoring ion concentration helps scientists understand and manage conditions like acidosis or alkalosis in the human body.