Percent change in acidity
Figure 2. The percent change in acidity with falling pH values is calculated as the percent change in hydrogen ion (H+) concentration relative to the starting concentration. In this figure, the concentrations of H+ ions are shown in decimal notation (middle column) for every tenth of a pH unit from 8.2 down to 7.2. The numbers in the percent change in acidity column reflect the percent increase in H+ concentrations between the starting point (8.2) and each successive number. Average global surface ocean pH has already fallen from a pre-industrial value of 8.21 to 8.10, corresponding to an increase in acidity of 28.8%. Values of 7.8–7.9 are expected by 2100, representing a 100–150% increase in acidity.
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