Consider the curve shown here for the titration of a weak base with a strong acid and answer each question.
a. What is the pH and what is the volume of added acid at the equivalence point?

Key Concepts

Titration

Titration is a quantitative analytical technique used to determine the concentration of a solute in a solution. It involves the gradual addition of a titrant (a solution of known concentration) to a sample until a reaction reaches completion, indicated by a color change or a pH change. In this case, the titration of a weak base with a strong acid will show a characteristic curve that helps identify the equivalence point.

Equivalence Point

The equivalence point in a titration is the stage at which the amount of titrant added is stoichiometrically equivalent to the amount of substance in the sample. For a weak base titrated with a strong acid, the pH at the equivalence point is typically less than 7 due to the formation of a weak conjugate acid. Understanding this point is crucial for determining the pH and volume of acid added.

pH Scale

The pH scale measures the acidity or basicity of a solution, ranging from 0 to 14. A pH of 7 is neutral, values below 7 indicate acidic solutions, and values above 7 indicate basic solutions. In the context of titration, the pH changes significantly as the titrant is added, and understanding how to interpret these changes is essential for identifying the pH at the equivalence point.