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A technician made some dilute sodium hydroxide solution by carefully adding some solid sodium hydroxide to pure water - Edexcel - GCSE Chemistry - Question 6 - 2013 - Paper 1
Question 6
A technician made some dilute sodium hydroxide solution by carefully adding some solid sodium hydroxide to pure water. This is the hazard symbol on a bottle of soli... show full transcript
Worked Solution & Example Answer:A technician made some dilute sodium hydroxide solution by carefully adding some solid sodium hydroxide to pure water - Edexcel - GCSE Chemistry - Question 6 - 2013 - Paper 1
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Describe what this shows about the effect of the surface area of calcium carbonate on the rate of this reaction.
Answer
The results show that smaller pieces of calcium carbonate produce a larger volume of carbon dioxide in a given time. This indicates that smaller pieces have a larger surface area, which allows for more efficient contact with the acid, leading to a faster reaction rate.
Step 5
Describe how you could use magnesium ribbon and a solution of hydrochloric acid to show that decreasing the concentration of the hydrochloric acid changes the rate of this reaction.
Answer
To demonstrate the effect of hydrochloric acid concentration on the reaction rate, you would prepare solutions of varying concentrations of hydrochloric acid. Measure equal lengths of magnesium ribbon and place them into separate beakers containing equal volumes of the different acid concentrations. Observe and measure the time taken for visible bubbles to form and the amount of gas produced. The reaction will proceed faster with higher concentration acid, as the frequency of collisions between acid particles and magnesium increases.