Question 8

Your teacher asked you to use your knowledge of precipitation reactions to test the quality of water in the local river.

You are provided with the following chemicals:

AgNO3, BaCl2, dilute HNO3

8.1 Which chemical would you choose to test for the presence of carbonates (CO3-2)? (1)

8.2 Use a balanced chemical equation to show the test for carbonates in QUESTION 8.1. (4)

8.3 Both carbonates and sulphates form a white precipitate with the chemical in QUESTION 8.1. Use a balanced chemical equation to explain how you would confirm that the precipitate is a carbonate. (4)

8.4 Give the chemical name of the precipitate formed when the carbonate and the chemical in QUESTION 8.1 reacts. (2)

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