pH & pOH

Front

What is pH?

Back

pH is a measure of the hydrogen ion concentration in a solution, indicating how acidic or basic it is. It is calculated as pH = -log[H+].

Front

What is pOH?

Back

pOH is a measure of the hydroxide ion concentration in a solution, indicating how basic or acidic it is. It is calculated as pOH = -log[OH-].

Front

What is the relationship between pH and pOH?

Back

pH + pOH = 14 at 25°C. This means that if you know one, you can calculate the other.

Front

What is the pH of a neutral solution at 25°C?

Back

The pH of a neutral solution at 25°C is 7.

Front

How do you calculate [H+] from pH?

Back

[H+] = 10^(-pH). For example, if pH = 2, then [H+] = 10^(-2) = 0.01 M.

Front

How do you calculate [OH-] from pOH?

Back

[OH-] = 10^(-pOH). For example, if pOH = 5, then [OH-] = 10^(-5) = 0.00001 M.

Front

What does a pH less than 7 indicate?

Back

A pH less than 7 indicates that the solution is acidic.

Front

What does a pH greater than 7 indicate?

Back

A pH greater than 7 indicates that the solution is basic.

Front

If the pH of a solution is 3, what is the [H+]?

Back

[H+] = 10^(-3) = 0.001 M.

Front

If the pOH of a solution is 4, what is the [OH-]?

Back

[OH-] = 10^(-4) = 0.0001 M.