Which pair of ions produce different colours in a flame test?
CHEMISTRY, M8 2016 HSC 13 MC
The flow chart shows the steps used to identify a sample of a substance.
If the substance is sodium sulfate, what should have been observed in Tests 1,2 and 3 ?
Test 1 | Test 2 | Test 3 | |
A. | Bright orange flame | No bubbles | White precipitate formed |
B. | Bright orange flame | Bubbles | No precipitate formed |
C. | Blue-green flame | No bubbles | No precipitate formed |
D. | Blue-green flame | Bubbles | White precipitate formed |
CHEMISTRY, M8 2015 HSC 3 MC
What flame colour do copper ions produce when heated?
- Brick red
- Blue-green
- Pale purple
- Yellow-orange
CHEMISTRY, M8 2017 HSC 2 MC
CHEMISTRY, M8 2020 HSC 22
A 0.1 mol L ¯1 solution of an unknown salt is to be analysed. The cation is one of magnesium, calcium or barium. The anion is one of chloride, acetate or hydroxide.
Outline a sequence of tests that could be performed in a school laboratory to confirm the identity of this salt solution. Include expected observations and a balanced chemical equation in your answer. (5 marks)
CHEMISTRY, M8 2022 HSC 5 MC
Which pair of ions can be distinguished using a flame test in the school laboratory?