Question

What is the purpose of keeping a test-tube containing lime water in each flask?

Answer 1

Answer:

there are several reasons but the main reason is :

to determine the presence of carbon dioxide

Explanation:

carbon dioxide turns lime water milky which indicates that air contains co2

Answer 2

The purpose of keeping a test-tube containing lime water in each flask is to determine the presence of carbon dioxide .

Explanation:

• The carbon dioxide turns lime water milky which indicates that air contains$co_{2}$
• Lime water changed into milky in the existence of $co_{2}$.
• It can be used to show that exhaled air contains more carbon dioxide than inhaled air.
• Carbon dioxide will dissolve in the water to form an acidic solution in a weak manner.
• "Hydrogen carbonate indicator" is used to show the "presence of carbon dioxide" in the solution. They are:

1. "Red at neutral pH" (no carbon dioxide)  

2. "Yellow at low pH" (carbon dioxide present)

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