Worksheet: Filtration and Crystallization

In this worksheet, we will practice separating mixtures using filtration and crystallization, deciding the apparatus needed, and determining when each should be used.

Q1:

Which of the following methods is the most appropriate for recovering a solute from a solution containing other, more soluble solutes?

  • ACrystallization
  • BCentrifugation
  • CFiltration
  • DEvaporation
  • EDistillation

Q2:

Which of the following methods is the most appropriate for separating a solid from a liquid?

  • ACrystallization
  • BEvaporation
  • CDistillation
  • DFiltration
  • ECentrifugation

Q3:

Which technique could be used to obtain pure solid copper sulfate from a solution of copper sulfate and sodium chloride in water?

  • AEvaporation
  • BCrystallization
  • CDistillation
  • DCentrifugation
  • EFiltration

Q4:

A student dissolves some sodium chloride in water and wants to recover it. Which technique should they use?

  • ACrystallization
  • BFiltration
  • CCentrifugation
  • DEvaporation
  • EDistillation

Q5:

A student must separate a sample of sand from a water suspension. Which technique should the student use?

  • AFiltration
  • BDistillation
  • CCrystallization
  • DEvaporation
  • ECentrifugation

Q6:

Which of the following methods is most appropriate for separating a solute from a simple mixture of solvent and solute?

  • ACentrifugation
  • BFiltration
  • CCrystallization
  • DEvaporation
  • EDistillation

Q7:

Which item of glassware is illustrated below?

  • AVolumetric flask
  • BErlenmeyer flask
  • CBüchner flask
  • DDistillation flask
  • ERound-bottom flask

Q8:

A mixture of sand and sodium chloride is commonly known as rock salt. Which of the following shows the correct order needed to separate sodium chloride from rock salt?

  • ADissolution in water → filtration → crystallization
  • BFiltration → dissolution in water → distillation
  • CFiltration → crystallization → dissolution in water
  • DCrystallization → dissolution in water → filtration
  • EDissolution in water → crystallization → filtration

Q9:

The given diagram shows the setup for a crystallization process. When should the heat be removed from the evaporating dish?

  • AWhen crystals start to form in the dish
  • BWhen the solution starts to boil
  • CWhen the crystals start to combust
  • DOnce the temperature reaches 100C
  • EAfter heating for exactly 5 minutes

Q10:

Why does heating a solution, and evaporating some of the solvent, induce crystallization?

  • AHeating causes the solute to oxidize and form crystals.
  • BThe solution becomes supersaturated and, upon cooling, causes crystals to form.
  • CA higher temperature reduces the amount of solute that dissolves in a solvent.
  • DThe energy needed to evaporate the solvent is taken from the energy of crystallization.

Q11:

A student wants to separate a mixture of sugar and salt. The mixture is first stirred into a beaker of ethanol to dissolve the sugar. A separation process is then used to remove the salt, before evaporation over a water bath yields crystals of sugar.

Why was ethanol used instead of water?

  • AEthanol boils at a higher temperature than water.
  • BEthanol reacts with salt to form a precipitate.
  • CSugar dissolves in ethanol better than in water.
  • DWater reacts with sugar.
  • EWater dissolves both salt and sugar.

What separation process was used to remove the salt?

  • AEvaporation
  • BFiltration
  • CChromatography
  • DCrystallization
  • EDistillation

Q12:

The given diagram shows the experimental apparatus for filtration.

What is the name of the solid that remains in the filter paper?

  • ALeftovers
  • BSediment
  • CFiltrate
  • DResidue
  • ERemains

What is the name of the liquid that passes through the filter paper?

  • AResidue
  • BWastewater
  • CExtract
  • DSolvent
  • EFiltrate

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