Identifying Acids
Chemistry: Cambridge International GCSE Supplement, topic 7.1.5
Determining if a Substance is an Acid or Alkali
There are many ways of determining whether a substance is an acid or an alkali. We can determine the pH directly, or we can use an indicator. Examples of indicators are:
Litmus paper
- Litmus paper is:
- Red in acid.
- Blue in alkali.
Methyl orange
- Methyl orange is:
- Red in acid.
- Yellow in alkali.
Test yourself on Identifying Acids
Which of these are true of litmus paper?