If litmus paper turns blue, the pH of the solution must beGroup of answer choicesacidic.above 7.0.less than 7.0.less than 4.0.
Question
If litmus paper turns blue, the pH of the solution must beGroup of answer choicesacidic.above 7.0.less than 7.0.less than 4.0.
Solution
To determine the correct answer, let's analyze the behavior of litmus paper in different pH environments:
- Litmus paper and pH: Litmus paper is a pH indicator used to test whether a solution is acidic or basic (alkaline).
- Color change:
- Blue litmus paper turns red under acidic conditions (pH less than 7).
- Red litmus paper turns blue under basic (alkaline) conditions (pH greater than 7).
Given that the litmus paper turns blue, it indicates that the solution is basic (alkaline).
- pH range:
- Acidic solutions have a pH less than 7.
- Neutral solutions have a pH of 7.
- Basic (alkaline) solutions have a pH greater than 7.
Therefore, if the litmus paper turns blue, the pH of the solution must be above 7.0.
The correct answer is: above 7.0.
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