The table shows four separate tests used to identify a dilute, aqueous sample of a compound - HSC - SSCE Chemistry - Question 13 - 2023 - Paper 1
Question 13
The table shows four separate tests used to identify a dilute, aqueous sample of a compound.
Test number | Test | Observations
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Worked Solution & Example Answer:The table shows four separate tests used to identify a dilute, aqueous sample of a compound - HSC - SSCE Chemistry - Question 13 - 2023 - Paper 1
Step 1
Test with red litmus
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Answer
The solution remains red when tested with red litmus, indicating that the solution is neutral or acidic. This suggests that the compound does not contain a strong base.
Step 2
Add Ba²⁺ ions to a sample
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Answer
The formation of a white precipitate upon adding Ba²⁺ ions indicates that the sample contains sulfate (SO₄²⁻) ions or carbonate (CO₃²⁻) ions, as barium sulfate and barium carbonate both form white precipitates.
Step 3
Add OH⁻ ions to a sample
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Adding OH⁻ ions and observing a brown precipitate suggests the presence of iron(II) ions (Fe²⁺). Iron(II) hydroxide (Fe(OH)₂) is a brown precipitate.
Step 4
Add Cl⁻ ions to a sample
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The formation of another white precipitate upon adding Cl⁻ ions suggests that the sample may contain barium or lead ions, as barium chloride (BaCl₂) and lead(II) chloride (PbCl₂) also produce white precipitates.
Step 5
Conclusion
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Based on the observations, the most likely compound that produces these results is A. Silver sulfate.
