An aqueous solution of a salt gives a white precipitate when mixed with aqueous silver nitrate and when mixed with dilute sulfuric acid - AQA - A-Level Chemistry - Question 16 - 2019 - Paper 3
Question 16
An aqueous solution of a salt gives a white precipitate when mixed with aqueous silver nitrate and when mixed with dilute sulfuric acid.
Which could be the formula ... show full transcript
Worked Solution & Example Answer:An aqueous solution of a salt gives a white precipitate when mixed with aqueous silver nitrate and when mixed with dilute sulfuric acid - AQA - A-Level Chemistry - Question 16 - 2019 - Paper 3
Step 1
Identify the Precipitate with Silver Nitrate
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Answer
When mixed with aqueous silver nitrate, a white precipitate indicates the formation of silver chloride (AgCl). This occurs when the chloride ion is present in the salt.
Step 2
Identify Reaction with Dilute Sulfuric Acid
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Answer
Dilute sulfuric acid further confirms the presence of barium ions (Ba²⁺) since barium sulfate (BaSO₄) is also a white precipitate. This indicates that the salt must contain Ba²⁺ or Cl⁻ ions.
Step 3
Evaluate the Given Options
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Answer
Checking the options:
A. BaCl₂ provides both Ba²⁺ and Cl⁻ ions, leading to the formation of both precipitates.
B. (NH₄)₂SO₄ has no precipitate formations with AgNO₃.
C. KCl would only precipitate with silver nitrate, not with dilute sulfuric acid.
D. Sr(NO₃)₂ does not lead to a white precipitate with dilute sulfuric acid.
