Titration

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Titration
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What is It?

• Acid and base combined together
• Graph of pH as a function of volume of titrant is
  called a titration curve

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Strong Acid/Strong Base

• Titration Curve

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• pH at the equivalence point in any titration is
  the pH of its resultant salt
• At equivalence point there is the same amount of
  acid and base
• No buffering occurs in strong acid and base
  titration
• What would curve for a strong base titrated by a
  strong acid look like?

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Example

• Calculate the pH when 49.00ml of .100M NaOH is
  added to 50.00ml of .100M HCl.

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Example

• How many ml of .50 M NaOH are required to reach
  the equivalence point by titrating 50.0 ml of
  .40M HBr?

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Weak Acid/Strong Base

• pH starts higher
• Rapid rise and then levels
  into a zone where pH
  doesnt change much
  (buffering zone)
• When enough base added
  to neutralize ½ acid called
  half equivalence pt.
  (middle
  of buffer zone and pH pKa)
• pH at equivalence pt is greater
  than 7

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Example

• Calculate the pH in the titration of acetic acid
  by NaOH after 30.0ml of .100M NaOH is added to
  50.0ml of .100M acetic acid.

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Example

• Draw and label a titration curve for a weak base
  titrated with a strong acid. Show the equivalence
  point, buffering zone, where pH pK.

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Polyprotic Acid Curves