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Edexcel IAL Chemistry 3.P12 Using apparatus and practical techniques

Identify the purpose of each material or operation, compare techniques when asked and state the only valid correction when a quantitative preparation has been compromised.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Explain drying agents, ceramic wool or anti-bumping granules through their practical function.
  • Compare suction with gravity filtration using speed and dryness of the collected solid.
  • Correct solution-preparation errors by restarting when excess solvent has passed the mark.

3.P12—Using apparatus and techniques question 1

[Maximum number: 1]

This question is about magnesium, magnesium oxide and magnesium sulfate.

Hydrated crystals of magnesium sulfate, MgSO4⋅7H2O\mathrm{MgSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}, can be made by reacting magnesium with sulfuric acid.

In an experiment, magnesium was added to 30.0 cm330.0 \mathrm{~cm}^{3} of 0.500 moldm−30.500 \mathrm{~mol} \mathrm{dm}^{-3} sulfuric acid.
[Mr\left[M_{\mathrm{r}}\right. value: MgSO4⋅7H2O=246.4Ar\mathrm{MgSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}=246.4 \quad A_{\mathrm{r}} value: Mg=24.3]\left.\mathrm{Mg}=24.3\right]

State how the magnesium sulfate solution could be separated from the mixture produced in this experiment.

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