PH Calculations

Front

What is the relationship between pH and pOH?

Back

pH + pOH = 14. This means that if you know the pH, you can find the pOH by subtracting the pH from 14.

Front

What does a low pH indicate about a solution?

Back

A low pH indicates that the solution is acidic and has a high concentration of hydrogen ions [H₃O⁺].

Front

What does a high pH indicate about a solution?

Back

A high pH indicates that the solution is basic (alkaline) and has a high concentration of hydroxide ions [OH⁻].

Front

How do you calculate pH from hydrogen ion concentration?

Back

pH = -log[H₃O⁺]. For example, if [H₃O⁺] = 1.0 x 10⁻⁴ M, then pH = 4.

Front

How do you calculate pOH from hydroxide ion concentration?

Back

pOH = -log[OH⁻]. For example, if [OH⁻] = 1.0 x 10⁻⁴ M, then pOH = 4.

Front

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

Back

The pH of a neutral solution at 25°C is 7.0.

Front

If the pH of a solution is 4.0, what is the pOH?

Back

10.0 (since pH + pOH = 14).

Front

If a solution has a very low pH, what can be said about its hydroxide concentration?

Back

The hydroxide concentration is very low.

Front

If a solution has a very high pH, what can be said about its hydroxide concentration?

Back

The hydroxide concentration is very high.

Front

What is the pOH of a solution with a hydronium ion concentration of 1.7 x 10⁻² M?

Back

12.23 (calculated using pOH = 14 - pH).