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 produced, it acts as a weak base. This means it will turn damp red litmus paper blue. The key aspect here is the observation; holding the litmus paper above the solid mixture allows the ammonia gas to come into contact with the paper, confirming its presence.

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