A basic solution changes from pH 13 to pH 10. Approximately how did its basicity change?
Answer and explanation
Correct answer: Decreased one thousand times
The pH scale is logarithmic, not linear. A change from pH 13 to pH 10 is a decrease of three pH units. For hydrogen-ion concentration, this represents a 10^3-fold increase in H+. Relative to the alkaline character, the solution is therefore approximately one thousand times less basic in the usual school-level interpretation. It remains basic because its pH is still above 7. Hence option A, not the linear distractor B, is correct.
Frequently asked questions
What is the correct answer to this question?
Decreased one thousand times
Why is this the correct answer?
The pH scale is logarithmic, not linear. A change from pH 13 to pH 10 is a decrease of three pH units. For hydrogen-ion concentration, this represents a 10^3-fold increase in H+. Relative to the alkaline character, the solution is therefore approximately one thousand times less basic in the usual school-level interpretation. It remains basic because its pH is still above 7. Hence option A, not the linear distractor B, is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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