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A sample of solid potassium hydroxide contained soluble, unreactive impurities - Edexcel - GCSE Chemistry - Question 10 - 2021 - Paper 1
Question 10
A sample of solid potassium hydroxide contained soluble, unreactive impurities. A student tried to find the mass of potassium hydroxide in the sample, using the fol... show full transcript
Worked Solution & Example Answer:A sample of solid potassium hydroxide contained soluble, unreactive impurities - Edexcel - GCSE Chemistry - Question 10 - 2021 - Paper 1
Step 1
Suggest three ways to improve this method to obtain a more accurate mass of pure potassium hydroxide.
Answer
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Use a volumetric flask: Instead of a beaker, using a volumetric flask for preparing the potassium hydroxide solution will provide a more precise volume. This ensures that the concentration of the solution is accurate.
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Use distilled (deionized) water: To avoid impurities affecting the results, distilled water should be used to dilute the potassium hydroxide, ensuring the solution is of known purity.
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Add solution dropwise: When adding sulfuric acid from the burette, it should be done dropwise as it approaches the endpoint. This allows for better monitoring of the color change and avoids overshooting the endpoint.