Hydroxide Ion Concentration

Worksheet Description

The worksheet work on the concepts and relationships between hydroxide ion concentrations, pH, and pOH values in aqueous solutions. The primary aim is to equip learners with the skills needed to calculate and understand pOH values, pH values, and both hydrogen and hydroxide ion concentrations.

The primary goals of this worksheet are:

Understand the relationships between hydroxide ion concentration, pOH, and pH.

Develop proficiency in calculating pH, pOH, and their respective ion concentrations.

Recognize that pH and pOH values are critical in many scientific domains, including chemistry and biology. They influence reactions and determine solution characteristics.

Depending on the data you have, choose the correct formula to calculate the needed value. If you have a pOH value and need to determine the pH, use their relationship and vice versa.

Concepts

pOH – The pOH of a solution represents the measure of its basicity. It is calculated as the negative logarithm (base 10) of the hydroxide ion ([OH-]) concentration. A lower pOH signifies a more basic solution due to higher [OH-].

pH – The pH value measures a solution’s acidity, obtained from the negative logarithm (base 10) of the hydrogen ion ([H+]) concentration.

Relationship between pH and pOH – At 25°C, the sum of the pH and pOH values for any given aqueous solution is 14.