Selma is writing a research paper on the alkalinity of seawater. her complete the sentences. the ph of seawater is , making it alkaline. seawater has a natural buffering mechanism. carbon dioxide dissolves in seawater and is present in the form of ions, which makes the seawater alkaline.

The pH of seawater is about 8.1, making it alkaline. 
The average pH of sea water is about 8.1 but it can also range between the pH value 7.9 to 9.0 as the result of the various activities that happen in the water. At this pH range, HCO3 ions are the major ions that are present, but as the pH of the water increases, the carbonate ions levels also increases, thus, when carbon dioxide dissolves in water it makes the water to  become acidic.