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The rate of reaction between magnesium and dilute hydrochloric acid depends on the concentration of the dilute hydrochloric acid - OCR Gateway - GCSE Chemistry: Combined Science - Question 10 - 2023 - Paper 4
Question 10
The rate of reaction between magnesium and dilute hydrochloric acid depends on the concentration of the dilute hydrochloric acid. Which concentration of dilute hydr... show full transcript
Worked Solution & Example Answer:The rate of reaction between magnesium and dilute hydrochloric acid depends on the concentration of the dilute hydrochloric acid - OCR Gateway - GCSE Chemistry: Combined Science - Question 10 - 2023 - Paper 4
Step 1
Which concentration of dilute hydrochloric acid reacts slowest with magnesium?
Answer
To determine which concentration of dilute hydrochloric acid reacts slowest with magnesium, we need to understand the relationship between concentration and reaction rate. Generally, a lower concentration of acid will lead to a slower reaction because there are fewer acid particles available to react with the magnesium.
We can analyze the given options:
- A: 0.089 mol/dm³
- B: 0.500 mol/dm³
- C: 0.038 mol/dm³
- D: 0.630 mol/dm³
Among these options, the lowest concentration is 0.038 mol/dm³ (option C). Therefore, the correct answer is C: 0.038 mol/dm³, as it will react the slowest with magnesium due to the reduced number of reactive H+ ions.