Photo AI
Which pair of ions can be distinguished using a flame test in the school laboratory? A - HSC - SSCE Chemistry - Question 5 - 2022 - Paper 1
Question 5
Which pair of ions can be distinguished using a flame test in the school laboratory? A. Ag⁺ and Mg²⁺ B. Ba²⁺ and Ca²⁺ C. Br⁻ and Cl⁻ D. Fe²⁺ and Fe³⁺
Worked Solution & Example Answer:Which pair of ions can be distinguished using a flame test in the school laboratory? A - HSC - SSCE Chemistry - Question 5 - 2022 - Paper 1
Step 1
B. Ba²⁺ and Ca²⁺
Answer
To distinguish between Ba²⁺ (barium ions) and Ca²⁺ (calcium ions) using a flame test, we observe the color of the flame produced when these ions are introduced into a flame:
- Barium (Ba²⁺): Produces a green flame, which is characteristic and can be easily identified.
- Calcium (Ca²⁺): Produces a brick-red or orange flame.
This difference in color allows us to distinguish between these two ions effectively in a school laboratory setting.