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Chloride ion precipitation test
A student investigated an aqueous solution of a salt. The student identified that the salt solution contained only sodium ions and chloride ions.
Describe a test to identify chloride ions. Give the result of the test.
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Marking points
- 1 States that acidified silver nitrate solution is added.
- 2 States that a white precipitate forms, paired with the accepted test.
Full-mark answer
Add acidified silver nitrate solution. A white precipitate forms.
Why this answer loses marks
Add silver nitrate and record that the solution changes colour.
The reagent should be acidified, and the answer must identify the white precipitate rather than a vague colour change.