In order to survive, the body fluids must be around 7.4.
In the last 100 years, the pH of the oceans has decreased from 8.2 to 8.1 with the increase in carbon dioxide emissions. This pH change has negative effects on life in the oceans. The pH of the soil where plants grow has significant effects on the mineral content of food. For basic food sources, the soil pH must be between 6-7. When the pH drops below 6 in the soil, calcium and magnesium fall. When it rises above pH 7 in the soil, iron, manganese, copper and zinc decrease. Therefore, when the soil is acidic, the pH of the soil is tried to be increased by adding fertilizer.
the only food with a pH greater than 7 (neutral) is rhubarb. Soils become acidic due to the decomposition of organic matter and the effect of rains that leaching the soil of alkaline minerals such as limestone and bauxite, in reality thousands of years of ash, lime, bone dust and oyster shell dust are used in fields as a form of to supply minerals and as a result end up making the pH of the soil neutral.
Just a point on the oceans, most marine organisms don’t care at all if PH is in a range from 8.4 - 7.8. Its only really calcifying animals that do (i.e. stony corals). No fish would care about thay drop directly.