Activity 4.7 NCERT Class 10 Science, Carbon and its Compounds

Activity 4.7 NCERT Class 10 Science, Carbon, and its Compounds

Brief procedure:

Activity 4.7 asks us to compare the PH of dilute acetic acid and dilute Hydrochloric acid using litmus paper and universal paper.


Activity 4.7 NCERT Class 10 Science litmus paperAcetic acid is a weak acid. Its PH range is 2 to 4. A typical,1M solution of acetic acid has a PH of 2.4. So on litmus paper, it shows a red-yellow colour. See activity 2.11.

Hydrochloric acid is a strong acid. It’s 0.1M solution has a PH of 1. It shows an utterly red colour with litmus paper.

Universal PH indicator: 
Universal PH indicator

A universal indicator is a mixture of various PH indicators which give sharp colour at different PH.

Here HCL gives red colour and acetic acid gives yellow.

Next: Activity 4.8 Esterification of alcohol.

Ref: Univeral indicator Wikipedia.

Leave a Comment