Worksheet: PH Indicators

In this worksheet, we will practice describing the color changes of common pH indicators and identifying suitable pH indicators for particular titrations.

Q1:

Fill in the blanks: Litmus is a mixture of dyes extracted from lichen. It can be used to detect if solutions are acidic or basic. It is in acidic solutions and in basic solutions.

  • Acolorless, pink
  • Bblue, red
  • Cpink, colorless
  • Dred, blue
  • Egreen, blue

Q2:

What is the key feature of a chemical that makes it useful as a pH indicator?

  • ALow molar mass
  • BSolubility in water
  • CCheapness
  • DColor changes with varying pH
  • ELow reactivity

Q3:

Fill in the blanks: Methyl orange is a useful indicator, particularly for titrations against acids. It is in strongly acidic solutions and in basic solutions.

  • Apink, colorless
  • Byellow, red
  • Cred, blue
  • Dred, yellow
  • Eyellow, blue

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