Ammonium ions can be identified in a solution by adding dilute sodium hydroxide solution and gently heating. If ammonium ions are present, they will be converted to ammonia gas. Ammonia has a characteristic choking smell. It also turns damp red litmus paper or damp universal indicator paper blue.
Answer
True
False
Question 7
Question
When NaOH is added to Fe2+, what colour is the precipitate?
Answer
Orange-brown
green
blue
Question 8
Question
When NaOH is added to Fe3+, what colour is the precipitate?
Answer
Green
Orange-brown
Blue
Question 9
Question
When NaOH is added to Cu2+, the precipitate is green
Answer
True
False
Question 10
Question
When dilute NaOH is added to Zn2+, a white precipitate forms