What will be the action of the followin.g substances on litmus paper? Dry HCl gas, Moistened NH3 gas, Lemon juice, Carbonated soft drink, Curd, Soap solution.?

Question

Answer

In hcl gas it will not change color... And in the other substances it will change color

Answer

a.

DryHCl gas does not liberate hydrogen ion, hence no action takes place with litmuspaper.

b.

NH₃ gasforms ammonium hydroxide in with water which turns red litmus paper blue.

c.

Lemonjuice is citric acid, so it turns blue litmus paper red.

d.

Carbonatesoft drink contains carbon dioxide dissolved in water. Carbon dioxide formscarbonic acid; with water; which turns blue litmus paper red.

e.

Curdcontains lactic acid and hence turns blue litmus paper to red.

f.

Soapsolution is basic in nature hence it turns red litmus paper to blue.

Answer

The Action of Substances on Litmus Paper:

Dry HCl gas:
When dry HCl gas comes into contact with litmus paper, it does not cause any immediate change in color. This is due to the fact that dry HCl gas does not have any aqueous or water-based properties. Therefore, it does not have the ability to ionize and release hydrogen ions (H+). As a result, it cannot change the color of litmus paper.

Moistened NH3 gas:
Moistened NH3 gas refers to ammonia gas that has been dissolved in water, creating an aqueous solution of ammonia. When moistened NH3 gas comes into contact with litmus paper, it turns the paper blue. This is because ammonia is a weak base and has the ability to accept hydrogen ions (H+). It reacts with water to form ammonium ions (NH4+) and hydroxide ions (OH-). The presence of hydroxide ions causes the litmus paper to turn blue, indicating the basic nature of ammonia.

Lemon juice:
Lemon juice is an acidic substance due to the presence of citric acid. When lemon juice comes into contact with litmus paper, it turns the paper red. This is because acids release hydrogen ions (H+) when they dissolve in water. The excess of hydrogen ions in the lemon juice reacts with the litmus paper, causing it to change color to red, indicating the acidic nature of lemon juice.

Carbonated soft drink:
Carbonated soft drinks typically contain carbonic acid, which is formed when carbon dioxide dissolves in water. When a carbonated soft drink comes into contact with litmus paper, it turns the paper red. This is because carbonic acid dissociates in water, releasing hydrogen ions (H+). The excess of hydrogen ions reacts with the litmus paper, causing it to change color to red, indicating the acidic nature of the carbonated soft drink.

Curd:
Curd, also known as yogurt, is slightly acidic in nature due to the presence of lactic acid. When curd comes into contact with litmus paper, it turns the paper red. This is because lactic acid dissociates in water, releasing hydrogen ions (H+). The excess of hydrogen ions reacts with the litmus paper, causing it to change color to red, indicating the acidic nature of curd.

Soap solution:
Soap solution is typically basic in nature. When soap solution comes into contact with litmus paper, it turns the paper blue. This is because soap contains a compound called sodium hydroxide (NaOH), which is a strong base. Sodium hydroxide dissociates in water, releasing hydroxide ions (OH-). The presence of hydroxide ions causes the litmus paper to turn blue, indicating the basic nature of soap solution.

In summary, dry HCl gas does not have any effect on litmus paper, moistened NH3 gas turns the paper blue, lemon juice and carbonated soft drinks turn the paper red indicating their acidic nature, while curd and soap solution turn the paper red and blue respectively, indicating their acidic and basic nature.

Similar Class 10 Doubts

Substance ‘X’ is formed by the oxidation of an aldehyde.What will be the action of the substance formed on the litmus solution?

What would be the color of litmus in a solution of sodium carbonate

hich of the following substances cannot be used to distinguish ethanol from ethanoic acid? A : Na metal B : NaHCO3 C : Hot alkaline KMnO4 solution D : Hot acidified K2Cr2O7 solution

Top Courses for Class 10View all

Science Class 10

Social Studies (SST) Class 10

Mathematics (Maths) Class 10

English Grammar Advanced

English Grammar Basic

Top Courses for Class 10

Top Courses for Class 10

Suggested Free Tests

Related Content

About Class 10

Class 10 Study Material

Class 10 All Subjects

NCERT Textbook Solutions

Other Classes

Important Links

Company