Edexcel IGCSE Chemistry 2.30 Biological metal extraction
Practise using universal indicator colours to estimate approximate pH and decide whether aqueous solutions are acidic or alkaline.
- Syllabus
- First assessment 2019
- Course
- Chemistry 4CH1
Exam points
- predict universal indicator colours from acid-alkali changes during addition of sodium hydroxide
- explain blue or purple universal indicator by linking it to OH- ions or an alkaline solution
2.30 Universal indicator question 1
[Maximum number: 2]
A teacher adds a small piece of lithium to water and collects the gas produced.
The teacher adds a few drops of universal indicator to the solution at the end of the reaction.
Explain the final colour of the universal indicator.
- blue / purple
- hydroxide ions / lithium hydroxide / an alkaline solution / an alkali / OH- ions are produced
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