Question

in the experimental set up given below, why does water level rise up in the bent tube?​

Answer 1

Answer:

Due to the formation of low pressure region in the flask, the water level rise up in the bent tube.

Explanation:

Given the experimental set up of aerobic respiration.

• The germinating seeds in the flask consume all the available oxygen and releases carbon dioxide.
• The potassium hydroxide(KOH) solution placed in the flask absorbs the released carbon dioxide.
• The acid-base reaction of $CO_2$ and KOH gives potassium carbonate and water.

        $CO_2 (g) + 2 KOH (aq) \rightarrow K_2CO_3 (aq) + H_2O (l)$

• Since the carbon dioxide is absorbed in the reaction, the volume of the gas in the flask will be reduced.
• This forms a relatively low pressure region  inside the flask than the beaker or we can say partial vacuum is created.
• The vacuum sucks the water from the beaker, hence the water rises in the bent tube.

Therefore, due to the formation of low pressure region in the flask, the water level rise up in the bent tube.

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Answer 2

Answer: The establishment of a low pressure zone in the flask causes the water level in the bent tube to rise, as a result of this formation.

We have been provided with the apparatus necessary for conducting the aerobic respiration experiment.

Aerobic Respiration: A chemical reaction in which energy is extracted from carbohydrates by using oxygen as a catalyst (sugars). Cell respiration, aerobic metabolism, and oxidative metabolism are all names for the same process.  

Explanation:

• The flask containing the germinating seeds produces carbon dioxide and uses up all of the oxygen in the surrounding environment.
• The potassium hydroxide (KOH) solution that has been placed in the flask is able to take in the carbon dioxide that has been emitted.
• The neutralization of the acid by the base KOH results in the formation of potassium carbonate and water.
• $CO_2(g)+ 2KOH(aq)\rightarrow K_2CO_3(aq)+H_2O(l)$
• Because the carbon dioxide is taken up by the reaction, the total amount of gas that is contained within the flask will become less.
• Because of this, the pressure within the flask is significantly lower than the pressure inside the beaker, therefore we may say that a partial vacuum has been generated.
• As a result of the vacuum sucking the water out of the beaker, the level of water in the bent tube will rise.

As a consequence of this, as a result of the establishment of a low pressure region in the flask, the water level rises up in the bent tube.

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