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Titration Curves

Titration Curves. Chemistry 3202. Titration Curves. A titration curve is a graph of changes in pH during a titration. The shape of the curve depends on the strengths of the acids and bases used in the titration. The endpoint occurs at the middle of the steep section of the curve.

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Titration Curves

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  1. Titration Curves Chemistry 3202

  2. Titration Curves • A titration curve is a graph of changes in pH during a titration. • The shape of the curve depends on the strengths of the acids and bases used in the titration. • The endpoint occurs at the middle of the steep section of the curve

  3. Strong Acid with Strong Base Endpoint pH = 7 acid is in the flask base is in the buret

  4. Strong Base with Strong Acid Endpoint pH = 7

  5. Weak Base with Strong Acid Endpoint pH < 7

  6. Endpoint pH > 7 Weak Acid with Strong Base

  7. SA with SB

  8. WB with SA

  9. SB with SA

  10. WA with SB

  11. WA with WB

  12. Diprotic acid with SB 2nd Endpoint 1st Endpoint

  13. Indicators • An indicator is a weak acid that changes color with changes in pH • To choose an indicator for a titration, the pH of the endpoint must be within the pH range over which the indicator changes color

  14. litmus methyl red chlorophenol red → blue to red → yellow to red → red to yellow What color change for each indicator? pH = 5.3

  15. Buffers • A solution of a WA and its conjugate base, or a WB and its conjugate acid is called a buffer solution. eg. a solution with both CH3COOH(aq) and CH3COO-(aq)

  16. Buffers • The pH of a buffer solution changes slightly when moderate amounts acid or base are added. • The buffer capacity is the amount of acid or base that can be added before considerable change in pH.

  17. Buffers • Write the equation to show what happens when: • acid (H3O+) & • base (OH-) is added to a CH3COOH(aq)/CH3COO-(aq) buffer.

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