An acidic solution has pH 2 and another acidic solution has pH 5. How many times higher is the hydrogen ion concentration in the first solution?
Answer and explanation
Correct answer: One thousand times
The pH relation is [H⁺] = 10⁻ᵖᴴ. Therefore, the ratio of the concentrations is 10⁻² ÷ 10⁻⁵ = 10³ = 1000. Equivalently, the pH difference is three units, and every one-unit decrease in pH means a tenfold increase in hydrogen-ion concentration. Hence the first solution has 1000 times more H⁺ and option A is correct.
Frequently asked questions
What is the correct answer to this question?
One thousand times
Why is this the correct answer?
The pH relation is [H⁺] = 10⁻ᵖᴴ. Therefore, the ratio of the concentrations is 10⁻² ÷ 10⁻⁵ = 10³ = 1000. Equivalently, the pH difference is three units, and every one-unit decrease in pH means a tenfold increase in hydrogen-ion concentration. Hence the first solution has 1000 times more H⁺ and 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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