CBSENEETClass 10
A solution turns red litmus blue, so what is its likely pH?
Answer
The solution is basic, so its pH is greater than 7.
The working
Read the clue
Red litmus turning blue is the standard test that shows the solution is basic in nature.
Link to pH
Basic solutions always have a pH greater than 7 at 25 °C.
Reason
A basic solution has more OH⁻ ions than H⁺ ions, which pushes the pH above 7.
Conclusion
Therefore the likely pH lies between 7 and 14, confirming the solution is a base.
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