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A litmus paper test is conducted for solutions I, II, and III respectively with the following results: I. Litmus turned red II.Litmus turned blue III Litmus didn't change colour What conclusions can be drawn from this?

A litmus paper test is conducted for solutions I, II, and III respectively with the following results: I. Litmus turned red II.Litmus turned blue III Litmus didn't change colour What conclusions can be drawn from this? Correct Answer Solution I is acidic, II is alkali and III is neutral

The correct answer is Solution I is acidic, II is alkali and III is neutral.

Key Points

  •  Litmus paper test
    • Litmus paper is a type of pH paper made by treating the paper with natural dyes from lichens.
    • The litmus test is performed by placing a small drop of sample onto the coloured paper.
    • Usually, litmus paper is either red or blue. Red paper turns blue when the pH is alkaline, while blue paper turns red when the pH turns acidic.
    • Litmus paper is most often used to test the pH of liquids, it can also be used to test gases if the paper is dampened with distilled water before exposure to the gas.
    • LItmus paper that has changed from red to blue can be reused as blue litmus paper. Paper that has changed from blue to red can be reused as red litmus paper.
    • Bases turn red litmus blue and acids turn blue litmus red.
    • Neutral paper turns into red colour under acidic conditions and blue colour under alkaline conditions.​​

Additional Information

Solution Red Litmus paper Blue Litmus paper
Acidic  Red Red
Basic Blue Blue
Neutral No change in colour No change in colour

Related Questions

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Consider the following statements.
1. Acids are sour in taste and change the colour of blue litmus to red.
2. Bases are bitter and change the colour of red litmus to blue.
3. Litmus is a natural indicator.
Which of the statements given above is/are correct?
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