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?

  • AMethyl orange changes from yellow to red.
  • BLitmus changes from blue to red.
  • CMethyl violet changes from violet to yellow.
  • DPhenolphthalein changes from colorless to pink.
  • EBromothymol blue changes from blue to yellow.

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?

  • A11
  • B9
  • C2
  • D7
  • E4

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?

  • A6
  • B8
  • C2
  • D10
  • E4

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
  • B3
  • C9
  • D7
  • 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?

  • ABromophenol blue
  • BThymolphthalein
  • CCresol red
  • DMethyl orange
  • EAlizarin

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