PAG 4- qualitative analysis of ions

Question 1

what is the correct order of tests when trying to identify ions in an unknown substance (4)

Answer 1

1) carbonate test
2) sulfate test
3) halide test
if carried out in the wrong order, false positive results are obtained

Question 2

what false positives can you get from performing the tests in the wrong order (3)

Answer 2

1) carbonate ions will give a false positive/ white precipitate in the sulphate test
2) sulfate ions will give a false positive / white precipitate in the halide test for chlorine
3) carbonate ions will give a false positive/ yellow-grey precipitate in the halide test for iodine