The pH and pOH of a solution are measures of the acidity or basicity of the solution. The pH of a solution is a measure of the concentration of hydrogen ions in the solution, with a lower pH indicating a higher concentration of hydrogen ions and a higher pH indicating a lower concentration of hydrogen ions. The pOH of a solution is a measure of the concentration of hydroxide ions in the solution, with a lower pOH indicating a higher concentration of hydroxide ions and a higher pOH indicating a lower concentration of hydroxide ions.

To calculate the pH of a solution, you can use the following formula:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in the solution.

To calculate the pOH of a solution, you can use the following formula:

pOH = -log[OH-]

where [OH-] is the concentration of hydroxide ions in the solution.

It’s important to note that the pH and pOH of a solution are related to each other through the relationship:

pH + pOH = 14

This relationship can be useful in solving problems involving the pH and pOH of a solution.

## Benefit

Knowing about pH and pOH can be useful in a number of different fields, including chemistry, biology, and environmental science. Understanding the acidity or basicity of a solution can provide important information about the chemical reactions that can occur in the solution and the effect that the solution may have on living organisms or the environment.

For example, in biology, pH can be important for understanding the conditions that are optimal for different types of cells or organisms to survive and function properly. Many cells and organisms have a preferred pH range and can be sensitive to changes in pH.

In environmental science, pH can be important for understanding the effect of pollution or other human activities on natural systems. Acid rain, for example, can have a negative impact on ecosystems because of its low pH.

Overall, learning about pH and pOH can provide a better understanding of the chemical and biological processes that occur in different systems, as well as the potential impacts of those processes on the environment and living organisms.

## Sample Test Question

1. A solution has a pH of 7. What is the pOH of the solution?
2. A solution has a pOH of 9. What is the pH of the solution?
3. A solution has a pH of 4.5. Is the solution acidic, basic, or neutral?
4. A solution has a pOH of 11.5. Is the solution acidic, basic, or neutral?
5. A solution has a pH of 2. What is the [H+] concentration of the solution?
6. A solution has a pOH of 12. What is the [OH-] concentration of the solution?
7. A solution has a [H+] concentration of 1 x 10^-6 M. What is the pH of the solution?
8. A solution has a [OH-] concentration of 5 x 10^-4 M. What is the pOH of the solution?
9. A solution has a pH of 3 and a [H+] concentration of 1 x 10^-3 M. Are the pH and [H+] concentration consistent with each other?
10. A solution has a pOH of 10 and a [OH-] concentration of 1 x 10^-10 M. Are the pOH and [OH-] concentration consistent with each other?

1. A solution has a pH of 7. What is the pOH of the solution? pOH = 14 – pH = 14 – 7 = 7
2. A solution has a pOH of 9. What is the pH of the solution? pH = 14 – pOH = 14 – 9 = 5
3. A solution has a pH of 4.5. Is the solution acidic, basic, or neutral? The solution is acidic.
4. A solution has a pOH of 11.5. Is the solution acidic, basic, or neutral? The solution is basic.
5. A solution has a pH of 2. What is the [H+] concentration of the solution? [H+] = 10^-pH = 10^-2 = 0.01 M
6. A solution has a pOH of 12. What is the [OH-] concentration of the solution? [OH-] = 10^-pOH = 10^-12 = 1 x 10^-12 M
7. A solution has a [H+] concentration of 1 x 10^-6 M. What is the pH of the solution? pH = -log[H+] = -log(1 x 10^-6) = 6
8. A solution has a [OH-] concentration of 5 x 10^-4 M. What is the pOH of the solution? pOH = -log[OH-] = -log(5 x 10^-4) = 3.3
9. A solution has a pH of 3 and a [H+] concentration of 1 x 10^-3 M. Are the pH and [H+] concentration consistent with each other? Yes, the pH and [H+] concentration are consistent with each other.
10. A solution has a pOH of 10 and a [OH-] concentration of 1 x 10^-10 M. Are the pOH and [OH-] concentration consistent with each other? Yes, the pOH and [OH-] concentration are consistent with each other.

## Ph And Poh Continued Worksheet with Answers 