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Question

In an experiment to study the properties of acetic acid, a student takes about 2 mL of acetic acid in a dry test tube. He adds about 2 mL of water to it and shakes the test tube well. He is likely to observe that.


A

the acetic acid dissolves readily in water

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B

the solution becomes light orange

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C

water floats over the surface of acetic acid

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D

acetic acid floats over the surface of water

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Solution

The correct option is A

the acetic acid dissolves readily in water


Explanation of correct option:-

Option (A): the acetic acid dissolves readily in water

  • There is the presence of -COOH group in acetic acid (CH3COOH).
  • -COOH group form hydrogen bond with water.
  • The hydrogen bond is a weak bond between two molecules that are formed because of the electrostatic attraction between a proton in one molecule and an electronegative atom in another one.
  • This will result in the dissolution of acetic acid (CH3COOH) in water.

CH3COOH(aq)Aceticacid+H2O(l)WaterH3O+(aq)Hydroniumion+CH3COO-(aq)Acetateion

Explanation of incorrect options:-

Option (B):- the solution becomes light orange

  • Acetic acid(CH3COOH) is a colorless liquid.
  • So, on getting dissolved in water, there won't be any color change in the solution.

Option (C):- water floats over the surface of acetic acid

  • The density of water is less than acetic acid (CH3COOH).
  • So, on adding acid there would be an exothermic reaction in the container and water won't float over the surface of acetic acid.

Option (D):- acetic acid floats over the surface of the water

  • Because the density of water is less than acetic acid (CH3COOH).
  • On adding, acetic acid (CH3COOH) will sink in.

Therefore, the correct option is (A):- the acetic acid dissolves readily in water.


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