Question 251 markMCQSection B

$A student adds 2 mL of acetic acid to a test tube containing 2 mL of distilled water. He then shakes the test tube well and leaves it to settle for some time. After about 5 minutes he observes that in the test tube there is:$

When acetic acid ($CH_3COOH$) is added to water and shaken, it dissolves completely to form a clear, transparent, and colourless solution.

Carbon and its Compounds

Properties of Ethanoic Acid

Options

(A)

a clear transparent colourless solution

(B)

a clear transparent pink solution

(C)

a precipitate settling at the bottom of the test tube

(D)

a layer of water over the layer of acetic acid

CH_3COOH

Acetic acid

Miscible

Clear

Transparent

Colourless

1. $Identification of the correct observation (clear transparent colourless solution). (1 mark)$

Hint

$Recall the physical properties of acetic acid and its behavior when mixed with water in the laboratory.$

Quick oral answer

$Acetic acid is completely miscible in water, so it forms a clear, colourless, homogenous solution.$

Acetic acid (ethanoic acid) is a polar organic compound that is highly miscible in water due to its ability to form hydrogen bonds with water molecules. Unlike oils or some other organic liquids, it does not form separate layers (distractor D) or precipitates (distractor C). It is a colourless liquid, so the resulting solution remains colourless (distractor B is incorrect as no indicator like phenolphthalein was added).

$A 5-8% solution of acetic acid in water is commonly known as vinegar.$

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$This question carries 1 mark in the CBSE Class 10 Science 2015 examination.$

$This question is from the chapter "Carbon and its Compounds" in the CBSE Class 10 Science syllabus.$

$This question covers the topic "Properties of Ethanoic Acid" from CBSE Class 10 Science.$

$This is a MCQ question from Section B in the CBSE Class 10 Science 2015 paper.$