What happens to hydrogen ion concentration as one moves up the pH scale?

As one moves up the pH scale, the hydrogen ion concentration decreases. The pH scale is logarithmic, meaning that each whole number change on the scale represents a tenfold change in the concentration of hydrogen ions. A lower pH corresponds to a higher concentration of hydrogen ions (more acidic), while a higher pH indicates a lower concentration of hydrogen ions (more basic or alkaline). Therefore, as the pH increases, the solution becomes less acidic and the concentration of hydrogen ions diminishes accordingly. This fundamental relationship is crucial in understanding acid-base chemistry and its implications in various biological processes.