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3 (a) A flame test is used to identify some metal ions in salts - Edexcel - GCSE Chemistry - Question 3 - 2014 - Paper 1
Question 3
3 (a) A flame test is used to identify some metal ions in salts. A flame test was carried out on a salt. The flame colour was orange-red. Complete the sentence by p... show full transcript
Worked Solution & Example Answer:3 (a) A flame test is used to identify some metal ions in salts - Edexcel - GCSE Chemistry - Question 3 - 2014 - Paper 1
Step 1
Step 2
3 (b) Draw one straight line from each metal ion to the colour of the precipitate formed
Answer
When metal ions react with sodium hydroxide, the following precipitates are formed:
- Aluminium ions, Al³⁺ → Blue
- Copper ions, Cu²⁺ → Green
- Iron(III) ions, Fe³⁺ → Red-brown
The lines drawn would be:
- Aluminium ions, Al³⁺ → Blue
- Copper ions, Cu²⁺ → Green
- Iron(III) ions, Fe³⁺ → Red-brown