A student investigates the rate of reaction between dilute hydrochloric acid and magnesium carbonate - OCR Gateway - GCSE Chemistry - Question 18 - 2020 - Paper 1
Question 18
A student investigates the rate of reaction between dilute hydrochloric acid and magnesium carbonate.
She wants to find out how the concentration of the acid change... show full transcript
Worked Solution & Example Answer:A student investigates the rate of reaction between dilute hydrochloric acid and magnesium carbonate - OCR Gateway - GCSE Chemistry - Question 18 - 2020 - Paper 1
Step 1
Labelled diagram showing gas syringe connected to conical flask
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Answer
To investigate the rate of reaction between dilute hydrochloric acid and magnesium carbonate, the apparatus should consist of:
A conical flask fitted with a gas syringe to collect the carbon dioxide produced during the reaction.
Dilute hydrochloric acid in the flask.
Magnesium carbonate measured out on a balance.
This setup allows accurate measurement of gas evolution, which correlates with the rate of the reaction.
Step 2
Measure known volume of acid
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Using a graduated cylinder, measure out a consistent volume of dilute hydrochloric acid, ensuring it is the same for all trials.
Step 3
Add known mass of magnesium carbonate
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Weigh out a specific mass of magnesium carbonate (e.g., 2 grams) using a balance for accuracy to ensure the reproducibility of results.
Step 4
Measure volume of gas every 30 seconds
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Record the volume of gas produced using the gas syringe every 30 seconds for a duration of 5 minutes. This data will help plot the rate of reaction against time.
Step 5
Repeat with different concentrations of acid
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Conduct the experiment again, varying the concentration of hydrochloric acid each time to analyze how it affects the rate of reaction, maintaining consistent conditions for valid comparisons.
