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4.2 Identifying the products of chemical reactions

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Question 29

A manufacturer analyses a pure white salt used in a heat-storage unit. The tests are carried out on separate portions of the salt.

TestObservation
Flame testOrange-red flame
Add dilute nitric acid, then silver nitrate solutionWhite precipitate
a.

Name the two ions in the salt and give the formula of the salt.

[3]
b.

A technician tests a further portion of the salt but adds dilute hydrochloric acid instead of dilute nitric acid before adding the silver nitrate solution.

Explain why this test cannot confirm whether the salt contains chloride ions.

[2]
Markscheme

4.2 Identifying the products of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /4.2 Identifying the products of chemical reactions

107 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.

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