Worksheet: Titration Indicators

In this worksheet, we will practice describing color changes of pH and redox indicators and selecting suitable indicators for specific reactions.

Q1:

A titration is performed with a basic titrant and acidic analyte. Which of the following color changes could be observed at the equivalence point?

  • ABromothymol blue changes from blue to yellow.
  • BMethyl orange changes from yellow to red.
  • CMethyl violet changes from violet to yellow.
  • DPhenolphthalein changes from colorless to pink.
  • ELitmus changes from blue to red.

Q2:

Litmus is used to detect the end point of an acid–base reaction. At which of the following pH values is the equivalence point likely to be detected?

  • A9
  • B7
  • C4
  • D2
  • E11

Q3:

Methyl orange is used to detect the end point of an acid–base reaction. At which of the following pH values is the equivalence point likely to be detected?

  • A2
  • B4
  • C8
  • D6
  • E10

Q4:

Phenolphthalein is used to detect the end point of an acid–base reaction. At which of the following pH values is the equivalence point likely to be detected?

  • A5
  • B7
  • C3
  • D9
  • E11

Q5:

Shown in the figure are the colors of common pH indicators and the pH values where color changes are observed.

Which of the following indicators would be most suitable for a titration of a weak acid against a strong base?

  • AMethyl orange
  • BCresol red
  • CAlizarin
  • DThymolphthalein
  • EBromophenol blue

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