Question

now that we know the ph of the ocean, we can determine how much of the dic is co₃²⁻ using the graph.
dic = h₂co₃ + hco₃⁻ + co₃²⁻
what percent of dic is co₃²⁻ at ph of 7.95?
5%
10%
25%

Explanation:

Step1: Locate pH value on graph

Locate pH = 7.95 on the x - axis of the graph. Since 7.95 is halfway between 7.9 and 8.0.

Step2: Read corresponding percentage

By visual inspection of the graph, the line representing the percentage of $\text{CO}_3^{2 -}$ in DIC is approximately at 10% when pH = 7.95.

Answer:

10%