pH/pOH Calculations

Front

What is pH?

Back

pH is a measure of the hydrogen ion concentration in a solution, indicating its acidity or basicity. It is calculated as pH = -log[H₃O⁺].

Front

What is pOH?

Back

pOH is a measure of the hydroxide ion concentration in a solution, indicating its basicity. It is calculated as pOH = -log[OH⁻].

Front

What is the relationship between pH and pOH?

Back

pH + pOH = 14 at 25°C.

Front

How do you calculate the pH from [H₃O⁺]?

Back

pH = -log[H₃O⁺]. For example, if [H₃O⁺] = 1 x 10⁻³ M, then pH = 3.

Front

How do you calculate the pOH from [OH⁻]?

Back

pOH = -log[OH⁻].

Front

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

Back

pOH = 14 - pH = 14 - 4 = 10.

Front

What is molarity (M)?

Back

Molarity is the number of moles of solute per liter of solution, expressed as M = moles of solute / liters of solution.

Front

How do you calculate the molarity after dilution?

Back

Using the formula M₁V₁ = M₂V₂, where M is molarity and V is volume.

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

What does a pH less than 7 indicate?

Back

A pH less than 7 indicates an acidic solution.