Question detail
Exam scenario ALC-f4c4c3b8: Use error diagnosis to explain how the evidence supports the objective "Calculate pH from hydrogen ion concentration." in pH and Kw (A-level only).
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Acids and bases (A-level only)
Question
Exam scenario ALC-f4c4c3b8: Use error diagnosis to explain how the evidence supports the objective "Calculate pH from hydrogen ion concentration." in pH and Kw (A-level only).
Answer
For ALC-f4c4c3b8, a strong answer should use error diagnosis to address pH and Kw (A-level only). It should identify the chemical principle in the objective "Calculate pH from hydrogen ion concentration.", apply the evidence from the prompt, and finish with a specific conclusion. This makes the question distinct from nearby items while preserving the same A-Level Chemistry curriculum coverage.
Explanation
For ALC-f4c4c3b8, a strong answer should use error diagnosis to address pH and Kw (A-level only). It should identify the chemical principle in the objective "Calculate pH from hydrogen ion concentration.", apply the evidence from the prompt, and finish with a specific conclusion. This makes the question distinct from nearby items while preserving the same A-Level Chemistry curriculum coverage.
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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