Once that happens, the carbon dioxide reacts with the water (H2O) creating bicarbonate ions resulting in less carbonate ions. This carbonate ion is needed to help marine organism to form their shells or skeletons. In addition to this reaction, there are leftover hydrogen ions causing seawater’s acidity to increase.
The problem derives from the ocean becoming increasingly acidic when it is supposed to be slightly basic. In 1751 to 1994, the ocean basicity went from 8.25 pH to 8.14 pH. It might not look like much of a difference, but the pH scale is logarithmic. In other words, the difference of one pH unit is equal to a ten-fold change in acidity. I like to acknowledge that not every part of the ocean will have the same pH level. That being said we can still see the change of pH over the years resulting in the same conclusion. The path we are going makes our future look grim not only for us, but marine organism