
Give any two tests to identify carboxylic acids.
Answer
506.4k+ views
1 likes
Hint: Carboxylic acids are organic compounds which contain carboxyl groups attached to the R-group. The general formula of carboxylic acid is , where R refers to alkyl groups.
Complete answer:
Carboxylic acids are organic compounds generally containing carboxyl groups attached to the R-group. The general formula of carboxylic acid is . Suffix used for carboxylic acids -oic acid. For example (methanoic acid), (ethanoic acid). Carboxylic acids are polar in nature because they are both hydrogen-bond acceptors (the carbonyl and hydrogen-bond donors (the hydroxyl and participate in hydrogen bonding. Carboxylic acids often have strong sour odors. Carboxylic acids tend to have higher boiling points than water, because of their greater surface areas and tendency to form stabilized dimers through hydrogen bonds.
There are many tests to identify carboxylic acid out of which two are:
a) Litmus Test:
Acids are the substances which turn blue litmus paper to red. The carboxylic acid also turns the blue litmus paper into red due to the presence of the hydroxyl group present in which is very acidic in nature as compared to alcohol.
The chemical reaction is as shown:
If the color of the blue litmus paper changes to red then a carboxyl group is present but this phenol also gives this test so we have to identify another test which gives results only for carboxylic acids.
(b) Sodium Bicarbonate Test:
When carboxylic acid reacts with sodium bicarbonate solution carbon dioxide is evolved with a brisk effervescence and sodium acetate is formed in this reaction and water is also produced.
The chemical reaction is as shown:
This test is used to distinguish between carboxylic acid from phenol as phenol does not give this test.
Note:
Carboxylic acids are mainly those organic compounds which have group and mainly termed as oic acid like methanoic, butanoic acids. There are many tests to identify the presence of carboxylic groups out of which two main methods; litmus test and sodium bicarbonate tests are performed to identify the group other than these ester tests are also there.
Complete answer:
Carboxylic acids are organic compounds generally containing carboxyl groups attached to the R-group. The general formula of carboxylic acid is
There are many tests to identify carboxylic acid out of which two are:
a) Litmus Test:
Acids are the substances which turn blue litmus paper to red. The carboxylic acid also turns the blue litmus paper into red due to the presence of the hydroxyl group present in
The chemical reaction is as shown:
If the color of the blue litmus paper changes to red then a carboxyl group is present but this phenol also gives this test so we have to identify another test which gives results only for carboxylic acids.
(b) Sodium Bicarbonate Test:
When carboxylic acid reacts with sodium bicarbonate solution carbon dioxide is evolved with a brisk effervescence and sodium acetate is formed in this reaction and water is also produced.
The chemical reaction is as shown:
This test is used to distinguish between carboxylic acid from phenol as phenol does not give this test.
Note:
Carboxylic acids are mainly those organic compounds which have
Latest Vedantu courses for you
Grade 8 | CBSE | SCHOOL | English
Vedantu 8 CBSE Pro Course - (2025-26)
School Full course for CBSE students
₹45,300 per year
Recently Updated Pages
Master Class 11 Business Studies: Engaging Questions & Answers for Success

Master Class 11 Economics: Engaging Questions & Answers for Success

Master Class 11 Accountancy: Engaging Questions & Answers for Success

Master Class 11 Computer Science: Engaging Questions & Answers for Success

Master Class 11 English: Engaging Questions & Answers for Success

Master Class 11 Maths: Engaging Questions & Answers for Success

Trending doubts
Which one is a true fish A Jellyfish B Starfish C Dogfish class 11 biology CBSE

Difference Between Prokaryotic Cells and Eukaryotic Cells

1 ton equals to A 100 kg B 1000 kg C 10 kg D 10000 class 11 physics CBSE

One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE

How much is 23 kg in pounds class 11 chemistry CBSE

Net gain of ATP in glycolysis a 6 b 2 c 4 d 8 class 11 biology CBSE
