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

This observation indicates the presence of ammonia gas, which is alkaline. Ammonia, when in contact with damp red litmus paper, will turn it blue due to its basic nature. Holding the litmus paper above the solid mixture allows the gas to diffuse and react before it is absorbed by the solid.

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