Tests for anions (AQA GCSE Chemistry): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
ShowHide
Practise the questions
12 questions from this quiz
What are anions?
What are anions?
Negative ions from non-metal elements
What should you add to test for carbonate ions?
What should you add to test for carbonate ions?
Any dilute acid
What do you observe when carbonate ions react with acid?
What do you observe when carbonate ions react with acid?
Fizzing and bubbles of carbon dioxide
What happens when carbon dioxide is bubbled through limewater?
What happens when carbon dioxide is bubbled through limewater?
It turns cloudy white
Why is the limewater test crucial in the carbonate test?
Why is the limewater test crucial in the carbonate test?
To confirm , as other reactions make gas
What should you add first when testing for sulfate ions?
What should you add first when testing for sulfate ions?
Dilute hydrochloric acid
What forms when testing for sulfate ions with barium chloride?
What forms when testing for sulfate ions with barium chloride?
White precipitate of barium sulfate
Why must acid be added first in the sulfate test?
Why must acid be added first in the sulfate test?
Carbonates give white precipitate too
What solution is added after nitric acid when testing for halides?
What solution is added after nitric acid when testing for halides?
Silver nitrate solution
What colour precipitate indicates chloride ions are present?
What colour precipitate indicates chloride ions are present?
White
What colour precipitate do iodide ions produce in the halide test?
What colour precipitate do iodide ions produce in the halide test?
Yellow
What is the key principle behind why these anion tests work?
What is the key principle behind why these anion tests work?
Formation of insoluble compounds