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A student is testing sodium carbonate solution - OCR Gateway - GCSE Chemistry - Question 13 - 2019 - Paper 2

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A student is testing sodium carbonate solution. She adds barium chloride solution followed by excess dilute hydrochloric acid. Which of these observations would no... show full transcript

Worked Solution & Example Answer:A student is testing sodium carbonate solution - OCR Gateway - GCSE Chemistry - Question 13 - 2019 - Paper 2

Step 1

A Colourless solution at the end

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Answer

This observation is likely to occur if the initial reactions proceed without any remaining precipitate.

Step 2

B Gas bubbles when the dilute acid is added

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Answer

Gas bubbles would be observed due to the reaction of the carbonate with the dilute hydrochloric acid, producing carbon dioxide.

Step 3

C White precipitate formed when the barium chloride solution is added

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Answer

The addition of barium chloride to sodium carbonate leads to a white precipitate of barium carbonate, which is a common occurrence.

Step 4

D White precipitate formed when the dilute acid is added

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Answer

This observation would not be seen as the dilute acid reacts with sodium carbonate, dissolving any precipitated barium carbonate back into solution.

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