Which observation would confirm that ammonia gas is released when solid ammonium chloride is warmed with solid calcium hydroxide? A Damp blue litmus paper turns red when touched onto the solid mixture. B Damp red litmus paper turns blue when touched onto the solid mixture. C Damp blue litmus paper turns red when held just above the solid mixture. D Damp red litmus paper turns blue when held just above the solid mixture.

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Which observation would confirm that ammonia gas is released when solid ammonium chloride is warmed with solid calcium hydroxide? A Damp blue litmus paper turns red when touched onto the solid mixture - AQA - A-Level Chemistry - Question 20 - 2018 - Paper 3

Question 20

Which observation would confirm that ammonia gas is released when solid ammonium chloride is warmed with solid calcium hydroxide? A Damp blue litmus paper turns red... show full transcript

Worked Solution & Example Answer:Which observation would confirm that ammonia gas is released when solid ammonium chloride is warmed with solid calcium hydroxide? A Damp blue litmus paper turns red when touched onto the solid mixture - AQA - A-Level Chemistry - Question 20 - 2018 - Paper 3

Step 1

Damp red litmus paper turns blue when held just above the solid mixture.

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Answer

When ammonia gas is released, it is alkaline in nature. Damp red litmus paper will turn blue in the presence of an alkaline substance. Therefore, the correct observation to confirm that ammonia gas is being released is option D. Holding the damp red litmus paper just above the solid mixture allows for the detection of any ammonia gas that may be escaping.

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