Draw a labelled diagram of the apparatus used to filter the mixture and collect the sodium chloride solution - Edexcel - GCSE Chemistry - Question 5 - 2020 - Paper 1
Question 5
Draw a labelled diagram of the apparatus used to filter the mixture and collect the sodium chloride solution. (2)
Describe how a sample of pure, dry sodium chloride... show full transcript
Worked Solution & Example Answer:Draw a labelled diagram of the apparatus used to filter the mixture and collect the sodium chloride solution - Edexcel - GCSE Chemistry - Question 5 - 2020 - Paper 1
Step 1
Draw a labelled diagram of the apparatus used to filter the mixture and collect the sodium chloride solution.
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Answer
To filter the mixture and collect the sodium chloride solution, the apparatus consists of a funnel and a conical flask. The funnel should have a filter paper placed inside it. The conical flask is placed beneath the funnel to collect the filtrate as it passes through.
Step 2
Describe how a sample of pure, dry sodium chloride crystals can be obtained from the filtrate.
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Answer
To obtain pure dry sodium chloride crystals from the filtrate, follow these steps:
Heat the sodium chloride solution to evaporate some of the water, concentrating the solution.
Allow the solution to cool, either by leaving it in a warm place or by placing it in a refrigerator to encourage crystallization.
Scrape the formed crystals from the container or pat them dry between filter papers.
Step 3
Calculate the Rf value of the dye that is present in both inks X and Z.
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Answer
The Rf value can be calculated using the formula:
Rf=DistancemovedbythesolventDistancemovedbythedye
Given that the solvent front moved 6.5 cm and assuming the dye moved 3.9 cm:
Rf=6.53.9=0.6
Step 4
State what could be changed in the experiment to make the Rf value more accurate.
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Answer
To make the Rf value more accurate, a longer piece of filter paper could be used during the chromatography process.
Step 5
Explain a change to the experiment that would be needed to separate the dyes in ink sample Y.
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Answer
To separate the dyes in ink sample Y, a different solvent should be used that allows the ink to dissolve. This can help in the effective separation of the dyes.
