A student wants to test a solution for chloride ions. The solution also contains carbonate ions.
The student adds dilute nitric acid before adding silver nitrate solution.
What is the purpose of the nitric acid?
To react with the chloride ions so that they form the precipitate
To stop the silver nitrate from reacting with the chloride ions
To remove the carbonate ions, which would also form a precipitate
To turn the chloride ions into chlorine so that they can be seen
52 exam-style questions on OCR GCSE Chemistry 4.2 Identifying the products of chemical reactions, covering 4.2.1 Tests to identify gases, 4.2.2 Tests for aqueous ions and flame tests, and 4.2.3 Instrumental methods of analysis. Each one has a worked solution and a mark scheme showing where the marks go.