Q&A for How to Test for CO₂

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Why should the test for carbon dioxide be performed immediately after collection of water sample?

Meredith Juncker, PhD
Scientific Researcher
Meredith Juncker is a PhD candidate in Biochemistry and Molecular Biology at Louisiana State University Health Sciences Center. Her studies are focused on proteins and neurodegenerative diseases.

Meredith Juncker, PhD

Scientific Researcher

Expert Answer

You want to perform the test immediately because the carbon dioxide that's present in the water can escape into the atmosphere if you wait.

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Is carbon dioxide harmful to humans?

Meredith Juncker, PhD
Scientific Researcher
Meredith Juncker is a PhD candidate in Biochemistry and Molecular Biology at Louisiana State University Health Sciences Center. Her studies are focused on proteins and neurodegenerative diseases.

Meredith Juncker, PhD

Scientific Researcher

Expert Answer

It depends on how much carbon dioxide is present. In small amounts, it's not harmful to humans. However, if a large amount of carbon dioxide is present and displaces the oxygen in the air, it can cause respiratory issues for humans. The lack of oxygen can cause a person to breath rapidly and experience rapid heartbeat. If the lack of oxygen happens for a long time, the person might have damage to the brain, heart, and other organs.

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Question

What happens to the calcium hydroxide solutions when carbon dioxide bubbles through it?

Community Answer

Calcium hydroxide, or limewater, will turn milky/cloudy when carbon dioxide is bubbled through it.

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How can oxygen gas be identified?

Community Answer

Keep the gas contained in a test tube. Then, light a splint (a stick of wood). Blow out the splint, then uncork the gas and place the splint inside while it is still glowing. If it is oxygen, then the splint should relight.

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Why does calcium hydroxide solution turn milky when calcium carbonate is added?

Community Answer

The calcium hydroxide solution reacts with the carbon dioxide to form calcium carbonate and water. The calcium carbonate is a solid and the particles are suspended in the solution, therefore the white precipitate causes the solution to turn milky.

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How do I test for CO2 in the air?

Community Answer

Capture the gas using a compressor, then cool the gas into a liquid. Fractional distillation can then be used to separate the gases with different boiling points. After this, you can use the tests above.

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What is a CO 2 test called?

Community Answer

If you bubble it through limewater, it's simply called "bubble it through limewater". However, if you're testing it with a match, then it's "testing it with a lit splint". There is no "proper" name for the test.

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Is CO2 present in water?

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Yes, if the water is carbonated, then it most likely contains CO2. That's about all.

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