Two solutions have pH values 2 and 6 respectively. How much greater is the hydrogen ion concentration in the first solution than in the second?
Answer and explanation
Correct answer: Ten thousand times
The governing relation is pH = −log₁₀[H⁺]. A decrease of one pH unit means a tenfold increase in hydrogen-ion concentration. The difference between pH 2 and pH 6 is 6 − 2 = 4 units, so the ratio is 10⁴ = 10,000. Equivalently, [H⁺] at pH 2 is 10⁻² mol/L and at pH 6 is 10⁻⁶ mol/L; their ratio is 10⁴. Therefore option A is correct.
Frequently asked questions
What is the correct answer to this question?
Ten thousand times
Why is this the correct answer?
The governing relation is pH = −log₁₀[H⁺]. A decrease of one pH unit means a tenfold increase in hydrogen-ion concentration. The difference between pH 2 and pH 6 is 6 − 2 = 4 units, so the ratio is 10⁴ = 10,000. Equivalently, [H⁺] at pH 2 is 10⁻² mol/L and at pH 6 is 10⁻⁶ mol/L; their ratio is 10⁴. 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.
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