Question

When carbon dioxide dissolves in water, it undergoes a multistep equilibrium process, with Koverall = 4.5x10⁻⁷, which is simplified to the following:(d) If the partial pressure of CO₂ in clean air doubles in the next few decades, what will the pH of rainwater become?

Answer 1

The entire atmosphere has a pressure of one atmosphere. As a result, the pressure at 700 ppm is 700x$10^{-6}$ atm. So, we can see that doubling CO₂ will result in a 0.15 pH unit decrease in the pH of rain.

What is pH?

• In chemistry, the pH scale is used to define the acidity or basicity of an aqueous solution.
• Historically, pH stood for "potential of hydrogen." The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.

• The hydronium concentration's negative log base 10 is known as pH.
• The pH is a logarithmic indicator of how many hydrogen ions are present in a solution.
• Since pH is measured on a log scale, a pH increase of 1 equates to a 10-fold increase in the concentration of hydrogen ions!

Learn more about pH here:

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