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Magnesium reacts with dilute hydrochloric acid to produce magnesium chloride and hydrogen gas - Edexcel - GCSE Chemistry - Question 5 - 2018 - Paper 1
Question 5
Magnesium reacts with dilute hydrochloric acid to produce magnesium chloride and hydrogen gas. (a) (i) Write the word equation for the reaction. (ii) State the for... show full transcript
Worked Solution & Example Answer:Magnesium reacts with dilute hydrochloric acid to produce magnesium chloride and hydrogen gas - Edexcel - GCSE Chemistry - Question 5 - 2018 - Paper 1
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Describe how the student should use the apparatus and materials listed to show how changing the concentration of the hydrochloric acid affects the rate of this reaction.
Answer
To investigate how changing the concentration of hydrochloric acid affects the rate of reaction with magnesium, the student should follow these steps:
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Measure Acid Volumes: Measure a fixed volume of hydrochloric acid. Do this for both concentrations (high and low).
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Prepare Magnesium Ribbon: Cut equal lengths of magnesium ribbon and ensure they have the same surface area to maintain consistent reaction conditions.
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Set Up Apparatus: Place the hydrochloric acid in a conical flask connected to a gas syringe. Ensure proper sealing to prevent gas escape.
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Start the Reaction: Add the magnesium ribbon to the conical flask and immediately start the stopwatch.
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Collect Gas: Observe and record the volume of hydrogen gas produced in the gas syringe over a fixed time. Measure how much hydrogen is produced at regular intervals.
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Repeat for Different Concentrations: Repeat the experiment using the other concentration of hydrochloric acid, keeping all other conditions constant (length and surface area of magnesium, temperature, etc.).
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Analyze Results: Compare the volume of hydrogen produced in a given time frame for both concentrations. The expectation is that higher concentration will yield a greater volume of hydrogen in a shorter time, demonstrating faster reaction rates.