In which condition will the concentration of hydrogen ions be highest?
Answer and explanation
Correct answer: Solution with pH 2
The governing relationship is pH = −log₁₀[H⁺]. Therefore, a lower pH corresponds to a greater hydrogen-ion concentration. A solution of pH 2 has [H⁺] = 10⁻² mol L⁻¹, while pH 5 has 10⁻⁵ mol L⁻¹; the former is 1000 times greater. pH 7 is neutral and pH 9 is basic with a much lower hydrogen-ion concentration. Hence A is correct.
Frequently asked questions
What is the correct answer to this question?
Solution with pH 2
Why is this the correct answer?
The governing relationship is pH = −log₁₀[H⁺]. Therefore, a lower pH corresponds to a greater hydrogen-ion concentration. A solution of pH 2 has [H⁺] = 10⁻² mol L⁻¹, while pH 5 has 10⁻⁵ mol L⁻¹; the former is 1000 times greater. pH 7 is neutral and pH 9 is basic with a much lower hydrogen-ion concentration. Hence 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.
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