Question detail
Calculate the pH of a solution with a hydrogen ion concentration of 0.0001 mol/dm³ (A-level cue 26913c30 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. 4
- B. 10 (A-level cue 26913c30 distractor 1)
- C. 1 (A-level cue 26913c30 distractor 2)
- D. 7 (A-level cue 26913c30 distractor 3)
Answer
4
Explanation
The correct option is 4. 4 is correct because it supports the objective: Calculate pH from hydrogen ion concentration.. 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 26913c30.
Common mistake
Incorrect pH Calculation
Students often forget to use the correct formula for calculating pH from hydrogen ion concentration, leading to incorrect pH values.
To calculate pH, use the formula pH = -log[H⁺]. Substitute the hydrogen ion concentration into the formula, perform the calculation, and ensure to express the final answer with the correct units. For example, if [H⁺] = 0.01 mol/dm³, then pH = -log(0.01) = 2. Therefore, the pH is 2.
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