Titration Curves - Grade 12 Chemistry
Explore titration curves, equivalence points, and indicator selection for acid-base titrations at a Grade 12 chemistry level.
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Titration Curves - Grade 12 Chemistry
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Read each question carefully and provide detailed answers based on your understanding of titration curves and acid-base chemistry.
1. Sketch a typical titration curve for a strong acid titrated with a strong base. Label the axes, the initial pH, the equivalence point, and the final pH.
2. Which of the following describes the titration of a weak acid with a strong base?
Starts at a low pH, equivalence point at pH 7, ends at a high pH.
Starts at a high pH, equivalence point at pH 7, ends at a low pH.
Starts at a moderately low pH, equivalence point above pH 7, ends at a high pH.
Starts at a moderately high pH, equivalence point below pH 7, ends at a low pH.
3. The point in a titration where the moles of acid exactly equal the moles of base is called the .
4. A chemical that changes color near the equivalence point to signal the end of a titration is called an .
5. For a strong acid-strong base titration, phenolphthalein (pH range 8.2-10.0) is a suitable indicator.
True
False
Match each term with its correct definition.
6. Titrant
a. The solution of unknown concentration in a titration.
7. Analyte
b. The solution of known concentration added from a burette.
8. Endpoint
c. The point where the indicator changes color.
9. A 25.0 mL sample of an unknown concentration of HCl is titrated with 0.100 M NaOH. If 18.5 mL of NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?