Question detail
What happens to limewater when carbon dioxide is bubbled through it?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Reactions of acids
Question
What happens to limewater when carbon dioxide is bubbled through it?
Answer
When carbon dioxide is bubbled through limewater, it reacts to form calcium carbonate, which makes the limewater turn cloudy.
Explanation
This answer is strong as it explains the chemical reaction that occurs and the observable change in limewater. The question assesses the student's ability to connect the presence of carbon dioxide with its effect on limewater.
Common mistake
Common Mistake in Testing for Carbon Dioxide
Students often confuse the test for carbon dioxide with the test for hydrogen gas, thinking that a lighted splint is used for both tests.
Remember that the test for carbon dioxide involves bubbling the gas through limewater, which turns milky, while the test for hydrogen gas uses a lighted splint that produces a 'pop' sound.
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