If two solutions have pH values 2 and 5 respectively, which solution is more acidic?
Answer and explanation
Correct answer: The one with pH 2
The pH scale is inversely related to hydrogen-ion concentration: a lower pH means a greater concentration of H⁺ ions and stronger acidity. Both pH 2 and pH 5 are below 7, so both solutions are acidic, but pH 2 is lower by three units. That corresponds to 10³, or 1000 times, greater hydrogen-ion concentration under comparable conditions. Therefore option A is correct.
Frequently asked questions
What is the correct answer to this question?
The one with pH 2
Why is this the correct answer?
The pH scale is inversely related to hydrogen-ion concentration: a lower pH means a greater concentration of H⁺ ions and stronger acidity. Both pH 2 and pH 5 are below 7, so both solutions are acidic, but pH 2 is lower by three units. That corresponds to 10³, or 1000 times, greater hydrogen-ion concentration under comparable conditions. Therefore option A 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.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
