A student investigated the temperature change in the reaction between dilute sulfuric acid and potassium hydroxide solution - AQA - GCSE Chemistry - Question 9 - 2019 - Paper 1
Question 9
A student investigated the temperature change in the reaction between dilute sulfuric acid and potassium hydroxide solution.
This is the method used.
1. Measure 25... show full transcript
Worked Solution & Example Answer:A student investigated the temperature change in the reaction between dilute sulfuric acid and potassium hydroxide solution - AQA - GCSE Chemistry - Question 9 - 2019 - Paper 1
Step 1
09.1 Suggest why the student used a polystyrene cup rather than a glass beaker for the reaction.
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Answer
Polystyrene is a better thermal insulator compared to glass. This means it effectively reduces energy exchange with the surrounding environment, helping to maintain the temperature during the reaction.
Step 2
09.2 Complete Figure 11:
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Answer
To complete Figure 11, plot all six data points from Table 6 accurately. Draw a line of best fit through these points, ensuring that both lines of best fit are extrapolated correctly until they intersect.
Step 3
09.3 Determine the volume of dilute sulfuric acid needed to react completely with 25.0 cm³ of the potassium hydroxide solution.
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Answer
From Figure 11, the volume of dilute sulfuric acid required to react completely with 25.0 cm³ of potassium hydroxide solution is determined to be 11 cm³.
Step 4
09.4 Determine the overall temperature change when the reaction is complete.
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Answer
The overall temperature change when the reaction is complete, as derived from Figure 11, is calculated from the initial temperature of 18.9 °C to the final temperature of 27.1 °C, resulting in an overall temperature change of 8.2 °C.
