Testing Water Purity Flashcards
0
Q
What reactions can you use to test?
A
Precipitation methods
1
Q
What are you testing the water for?
A
Various dissolved ions
2
Q
Test for sulphate ions using what?
A
Barium chloride
3
Q
What are the three steps for the sulphate ions test?
A
- Add some dilute hydrochloric acid to the test sample, 2. add 10 drops of barium chloride solution 3. If you see white precipitate then sulphate ions are present.
4
Q
What is the equation for barium chloride?
A
Barium ions+ sulfate ions —> barium sulfate
Ba2+ + So4 2- —–> BaSO4
5
Q
Test for halide ions using what?
A
Silver nitrate
6
Q
What are the three steps for halide ions?
A
1) add some dilute nitric acid to test sample
2) add 10 drops of silver nitrate solution
3) if halide ions present, precipitate will form.
7
Q
For chloride ions it will produce what colour precipitate?
A
White
8
Q
What colour precipitate for bromide and iodide ions?
A
Cream for bromine and pale yellow for iodide
