C4.2.3 - Detecting anions Flashcards
1
Q
How do you detect sulfate ions?
A
- Add a few drinks of dilute hydrochloric acid
- Then add a few drops of barium chloride solution
If sulfate ions are present, you get a white precipitate
2
Q
What do barium ions and sulfate ions produce?
A
White, insoluble barium sulfate
3
Q
What do hydrogen ions from dilute acid and carbonate ions produce?
A
Carbon dioxide and water
4
Q
How do you detect carbonate ions?
A
- Add a few drops of dilute hydrochloric acid
- If carbonate ions are present, bubbles of gas will be produced
- You can confirm it is CO2 by bubbling it through limewater. You could use nitric acid, but dilute hydrochloric acid is used more often
5
Q
Out of all the silver halides which one is soluble in water?
A
Silver fluoride
6
Q
How do you detect halide ions?
A
- Add a few drops of dilute nitric acid
- Then a few drops of silver nitrate solution
- If chloride, bromide or iodide ions are present, you get a precipitate
7
Q
What is the colour of a silver chloride precipitate?
A
White
8
Q
What is the colour of a silver bromide precipitate?
A
Cream
9
Q
What is the colour of a silver iodide precipitate?
A
Yellow
