pH and pOH Concepts

Vocabulary flashcards related to pH and pOH concepts from the chemistry lecture.

pH

A measure of the acidity or basicity of a solution, defined as the negative logarithm of the concentration of hydrogen ions (H3O+).

pOH

A measure of the basicity of a solution, defined as the negative logarithm of the concentration of hydroxide ions (OH−).

pH Scale

A logarithmic scale used to specify the acidity or basicity of an aqueous solution, ranging from 0 to 14.

Water's pH at 25°C

The pH of pure water at 25 degrees Celsius is 7, indicating a neutral solution.

Acidic Solution

A solution with a pH less than 7, having an excess of H3O+ ions.

Basic Solution

A solution with a pH greater than 7, having an excess of OH− ions.

Relationship of pH and pOH

pH + pOH = 14 at 25°C.

Logarithmic Nature of pH

Each unit change in pH represents a tenfold change in acidity.

Hydronium Ion ([H3O+])

A water molecule (H2O) that has an extra proton, forming H3O+; it indicates acidity in a solution.

Hydroxide Ion ([OH−])

A negatively charged ion formed by the removal of a proton from water (H2O); it indicates basicity in a solution.