Question detail
Calculate the hydrogen ion concentration of a solution with a pH of 5 (A-level cue 26b14b40 focus)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Acids and bases (A-level only)
Question
- A. 1.0 x 10^-5 mol/dm3
- B. 1.0 x 10^-2 mol/dm3 (A-level cue 26b14b40 distractor 1)
- C. 1.0 x 10^-7 mol/dm3 (A-level cue 26b14b40 distractor 2)
- D. 1.0 x 10^-1 mol/dm3 (A-level cue 26b14b40 distractor 3)
Answer
1.0 x 10^-5 mol/dm3
Explanation
The correct option is 1.0 x 10^-5 mol/dm3. 1.0 x 10^-5 mol/dm3 is correct because it supports the objective: Calculate hydrogen ion concentration from pH.. The reasoning stays within pH and Kw (A-level only) and avoids drifting into a similar A-Level Chemistry idea. This version is uniquely anchored to pH and Kw (A-level only). Retrieval anchor: A-level cue 26b14b40.
Common mistake
Common Mistake in pH Calculation
Students often confuse the relationship between pH and hydrogen ion concentration, leading to incorrect calculations.
To calculate hydrogen ion concentration from pH, use the formula [H⁺] = 10^(-pH). Substitute the given pH value into the formula and calculate the concentration. For example, if pH = 3, then [H⁺] = 10^(-3) = 0.001 mol/dm³.
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