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Checking Salt Identity With a Flame and Ion Test 4 questions
Checking Salt Identity With a Flame and Ion Test
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A salt exhibit uses model flame and anion tests. In the flame test, excited atoms give a characteristic line as they lose energy. The exhibit uses a 589 nm line as a sodium marker and a 671 nm line as a lithium marker. The anion test separately reports chloride or bromide.
| Sample | Flame line (nm) | Anion result |
|---|---|---|
| P | 589 | Chloride |
| Q | 589 | Bromide |
| R | 671 | Chloride |
Question 1
Which two samples show evidence of the same positive ion before the flame test?
- P and Q
- P and R
- Q and R
- All three
Question 2
Use the electron model to explain why a sodium line can appear even when the original salt has a different anion.
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Question 3
A student says P and Q must be identical compounds because they give the same flame line. Use both tests to evaluate the claim.
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An unknown gives only the 589 nm line. It also gives both anion results. Assume the unknown contains only some of the three model salts.
Question 4
Identify which two samples could be mixed to fit the unknown. Explain why including R would conflict with the observed flame line.
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