The pH scale is used to measure how acidic or basic a water-based solution is. A pH value below 7 indicates an acid; and above 7 indicates a base. While the ocean is still basic or alkaline, ...

The pH scale goes from 0 to 14 with pH 7 as the neutral ... that are held in the organic matter. Soils tend to become acidic as a result of: (1) rainwater leaching away basic ions (calcium, magnesium, ...