Acid and Base outline

[Lauren Eng 1G]

In the outline for Acid and Base equilibria, it says that we should be able to

Calculate the pH in these industrial, environmental, and biological examples: Carbon dioxide
reacts with water to form carbonic acid, which makes carbonated drinks acidic, acidic rain, rivers,
and lakes in the environment, and respiratory acidosis and death in biological systems.

What are the steps in determining the pH of these examples?

[Angela Yang 2J]

I think it would depend on what information we are given in each example but I would imagine it would involve writing out the chemical equations and being able to apply the pH equations.