QQuestionChemistry
QuestionChemistry
Why isn't the pH at the equivalence point always equal to 7 in a neutralization titration?
6 months agoReport content
Answer
Full Solution Locked
Sign in to view the complete step-by-step solution and unlock all study resources.
Step 1: Understand the concept of pH and the equivalence point in a titration.
- pH is a measure of the hydrogen ion concentration in a solution, with lower pH indicating higher acidity and higher pH indicating lower acidity. - The equivalence point in a titration is the point at which the amount of titrant added is exactly stoichiometrically equivalent to the amount of analyte present.
Step 2: Recognize that the equivalence point pH is not always equal to 7 in a neutralization titration.
- In a neutralization titration, a strong acid is titrated with a strong base or vice versa. At the equivalence point, the moles of H+ ions and OH- ions are equal, and they react to form water. - However, the pH at the equivalence point is not always equal to 7 due to the presence of excess strong base or strong acid, which can cause the pH to be higher or lower than 7, respectively.
Final Answer
The pH at the equivalence point in a neutralization titration is not always equal to 7 due to the presence of excess strong base or strong acid, which can cause the pH to be higher or lower than 7, respectively. The pH at the equivalence point can be calculated using the formula pH = 14 + log([B-]) - log([HA]), where [B-] is the concentration of the base and [HA] is the concentration of the acid.
Need Help with Homework?
Stuck on a difficult problem? We've got you covered:
- Post your question or upload an image
- Get instant step-by-step solutions
- Learn from our AI and community of students