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Flaming the mouth of a test tube creates an air flow. Hot air rises. Therefore dust/particles in the air are less likely to fall into your tube.

There is some controversy as to the value of this action. The hot air will also create eddy currents across the mouth of the tube or flask which may actually increase the opportunity for contamination. If there is some data which supports either view, I would like to see it. In my opinion, the reason behind flaming the mouth of a test tube has not been proven, it is just taken to be dogma.

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13y ago
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AnswerBot

5mo ago

Flaming the mouth of a test tube is done to ensure that the equipment is sterile and to prevent contaminants from entering the tube. This is important for experiments where sterility is required and to avoid any interference with the results.

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14y ago

The purpose of flaming the test tube when putting in or out microbes is to prevent

contamination of its content which could normally comes from the ambient air.

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Wiki User

11y ago

This actually sterilizes the mouth of the test tube. It is a back up to prevent contamination.

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Q: Why reason for flaming the mouth of test tube?
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Test tube mouth up: nothingTest tube mouth down: the denser gas can escape


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What happens when you blow over the mouth of a test tube which is half filled with water?

Blowing over the mouth of the test tube will create a decrease in air pressure inside the tube. This decrease in pressure will cause the water in the test tube to rise up due to the higher pressure outside the tube. Ultimately, the water level in the test tube will rise as a result of the change in pressure.


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The most important aspect of heating liquids in a test tube is to never look directly into the mouth of the test tube, as liquid may spurt out and come into contact with your eyes or face. However, if you are wearing plastic safety glasses, the substance may not harm you, depending on the type of substance you are heating.


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Placing the test tube holder near the mouth of test tube?

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What happens when a piece of Mg ribbon is place in a test tube with Hydrochloric acid and cover the mouth of the test tube?

Metal + Acid --> Salt + Hydrogen Gas. As a result, the end product of this reaction is magnesium chloride and hydrogen gas. Covering the mouth of the test tube simply prevents the hydrogen gas from escaping, and allows you to test for its presence by using a lighted splint.


In heating chemicals in a test tube where should the mouth of the test tube point?

The mouth of the test tube should be pointed away from yourself and others to prevent any splashes or fumes from coming into contact. This is important for safety measures and to avoid any potential accidents during the heating process.


What is the process by which ammonia gas is produce at the bottom of the test tube comes in contact with the litmus paper at the mouth of the test tube?

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