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The change of colour is due to chemical reaction. Almost all chemical reactions take place in solution. So dry litmus paper not shown any change in colour with hydrogen chloride gas. The colour changes only when the paper is dipped in water. In other word the paper is wet.
Added:
To be more precise:
Hydrogen chloride gas, when dry, is not an acid. Without water it can not donate protons to litmus, so this will not change color
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Why a dry blue litmus paper is not affected by hydrogen chloride gas?
Dry blue litmus paper does not change color in the presence of hydrogen chloride gas because it is already in its acidic form. Hydrongen chloride is an acidic gas that does not cause a reaction with blue litmus paper. The blue color of the litmus paper is retained because there is no alkali to neutralize in order to cause a color change.
Why does dry HCl gas does not change the colour of the dry litmus paper?
Hydrogen chloride gas is not an acid, is not in solution and does not donate protons. So, no litmus paper color change.
What is the reaction with litmus paper after boiling the water and ferric chloride mixture?
Boiling the water and ferric chloride mixture will not change the color of litmus paper, as litmus paper is not sensitive to the presence of ferric chloride. Litmus paper is typically used to test for acidity or basicity in a solution.
What colour does litmus paper turn in sodium chloride acid?
- sodium chloride is not an acid - in an acid solution the blue litmus paper become red
What is the chemical equation of the reaction of litmus paper to sodium chloride?
Litmus paper is a mixture of dyes that change color depending on the acidity or alkalinity of a solution. When exposed to sodium chloride, which is a neutral salt, litmus paper does not undergo a chemical reaction. It remains unchanged in the presence of sodium chloride.
What color does hydrogen chloride turn damp litmus paper?
Hydrogen chloride turns damp blue litmus paper red.
Why a dry blue litmus paper is not affected by hydrogen chloride gas?
Dry blue litmus paper does not change color in the presence of hydrogen chloride gas because it is already in its acidic form. Hydrongen chloride is an acidic gas that does not cause a reaction with blue litmus paper. The blue color of the litmus paper is retained because there is no alkali to neutralize in order to cause a color change.
Does hydrogen peroxide turns litmus paper blue or red?
hydrogen peroxide turns litmus paper into blue.
Why does dry HCl gas does not change the colour of the dry litmus paper?
Hydrogen chloride gas is not an acid, is not in solution and does not donate protons. So, no litmus paper color change.
What is the reaction with litmus paper after boiling the water and ferric chloride mixture?
Boiling the water and ferric chloride mixture will not change the color of litmus paper, as litmus paper is not sensitive to the presence of ferric chloride. Litmus paper is typically used to test for acidity or basicity in a solution.
What color does hydrogen sulphide turn damp litmus paper?
Hydrogen sulfide turns damp litmus paper from blue to red.
What colour does litmus paper turn in sodium chloride acid?
- sodium chloride is not an acid - in an acid solution the blue litmus paper become red
What is the chemical equation of the reaction of litmus paper to sodium chloride?
Litmus paper is a mixture of dyes that change color depending on the acidity or alkalinity of a solution. When exposed to sodium chloride, which is a neutral salt, litmus paper does not undergo a chemical reaction. It remains unchanged in the presence of sodium chloride.
What color does sodium chloride give on litmus paper?
Sodium chloride solution is neutral.
Which solution will not have any effect on both red litmus paper and blue litmus paper?
a)sulfur dioxide b)hydrogen chloride c)potassium sulfate d)slaked lime
What gas is produced when moist blue litmus turn red?
When moist blue litmus paper turns red, it indicates the presence of an acidic gas such as carbon dioxide (CO2) or sulfur dioxide (SO2). This change in color is due to the acidification of the blue litmus paper by the acidic gas.
What would happen when blue litmus is put in ferric chloride solution?
Blue litmus paper would turn red in ferric chloride solution due to the acidic nature of the solution, which would cause a change in the pH of the litmus paper turning it to red.
