Photo AI
Tests are used to identify ions in three salts X, Y and Z - Edexcel - GCSE Chemistry - Question 2 - 2015 - Paper 1
Question 2
Tests are used to identify ions in three salts X, Y and Z. (a) (i) In a flame test salt X gives a yellow flame. What is the metal ion in salt X? Put a cross (X) in ... show full transcript
Worked Solution & Example Answer:Tests are used to identify ions in three salts X, Y and Z - Edexcel - GCSE Chemistry - Question 2 - 2015 - Paper 1
Step 1
Step 2
Describe how a flame test is carried out on a solid.
Answer
To perform a flame test on a solid, follow these steps:
- Clean a platinum or nichrome wire loop by dipping it in hydrochloric acid and then holding it in the flame until it burns without color.
- Allow the wire to cool, then dip it into the solid sample to pick up a small amount.
- Place the wire into the flame of a Bunsen burner and observe the color produced. The color indicates the presence of specific metal ions.
Step 3
Step 4
Describe what is seen when sodium hydroxide solution is added to a solution of Z.
Answer
When sodium hydroxide solution is added to a solution containing iron(III) ions, Fe³⁺, a reddish-brown precipitate of iron(III) hydroxide, Fe(OH)₃, is seen. This occurs as the iron ions react with hydroxide ions to form the insoluble hydroxide.