In this class experiment, studentsseparatea mixture that sand and salt, illustrating the an essential means that separating a mixture the aninsolublematerial from one the issoluble

This is a an extremely straightforward experiment. It deserve to be lugged out personally or in teams of two. Pupils have to stand up during heating activities and beware of hot salt spitting when evaporation is practically complete.

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Eye protectionBeaker, 250 cm3Glass stirring rodFilter funnelFilter paperConical flask, 250 cm3Evaporating basinBunsen burnerHeat resistant matTripodGauze


Mixture of sand and sodium chloride (salt), about 6–7 g per team of student (asuitable sand–salt mixture have to contain about 20% salt through mass)

Health, safety and technical notes

Wear eye defense throughout this experiment.Pupils have to stand up during heating activities and beware of warm salt spitting as soon as evaporation is almost complete.Sodium chloride (eg table salt), NaCl(s)- see CLEAPSSHazcard HC047b.


Pour the sand–salt mixture right into the beaker so the it simply covers the base.Add around 50 cm3of water, or add water till the maker is about one-fifth full.Stir the mixture gently for a few minutes.Filter the mixture right into a conical flask.Pour the filtrate right into an evaporating basin.Heat the salt systems gently until it starts to decrepitate (spit).CARE:Keep eye defense on and do not obtain too close.Turn off the Bunsen burner and also let the damp salt dry in the dish.
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Source: Royal culture of Chemistry

Equipment because that a class experiment to separate a mixture that sand and also salt.

Teaching notes

If desired, the experiment have the right to be prolonged to isolate dried samples that sand and also salt. To execute this, the damp sand in the filter record can be moved to one more sheet of dried filter paper, and, by folding and dabbing, the sample deserve to be dried. If necessary, another piece that filter file can be used.

Students regularly like to existing their specimens in tiny bottles for approval, so a spatula can be offered to attain this. When the first student that a pair is moving the sand, the other deserve to be scraping the dried salt native the evaporating dish and transferring that to another specimen bottle.

If this expansion is carried out, the students have to be urged to label the bottles. They should be told that all samples prepared in this way need to it is in labelled, also if in this case, it need to be noticeable which problem is which.

Student questions

Why have the right to sand and also salt it is in separated using this experiment?Why is the salt, sand and water mixture stirred in action 3?Why is the salt systems heated in step 6?How could the last traces that water be eliminated from her samples to ensure that they are completely dry?Give two reasons why the sand you have actually obtained can still it is in contaminated through salt.How can you adapt your experiment to obtain a purer sample that sand?Give two reasons why the salt you have actually obtained might still it is in contaminated with sand.How can you adapt your experiment to achieve a purer sample the salt?

Primary science teaching notes

If girlfriend teach major science, the adhering to information is designed to aid you use this resource.

Skill development

Childrenwill construct their functioning scientifically an abilities by:

Drawing conclusions and raising additional questions that could be investigated, based upon their data and observations.Using appropriate scientific language and ideas to explain, evaluate and also communicate their methods and also findings.

Learning outcomes

Children will:

Observe the some materials will dissolve in fluid to type a solution.Describe exactly how to recover a substance from a solution.Use expertise of solids, liquids and also gases come decide how mixtures can be separated, including through filtering, sieving and evaporating.Demonstrate the dissolving, mixing and changes the state are reversible changes.

Concepts supported

Children will learn:

That there room various techniques that can be supplied to separate different mixtures.That dissolving is a reversible reaction.That no all solids room soluble.That the rate of dissolving have the right to be impacted by miscellaneous factors.That melting and also dissolving space not the exact same process.

Suggested activity use

This activity can be supplied as a whole-class investigation, with youngsters working in little groups or bag to look at just how to separate the salt and sand. This could carry out a economic stimulation for more investigations feather at how to separate other mixtures of solids, one of two people of various particle size or by solubility.

Practical considerations

Primary schools often don’t have actually Bunsen burners, for this reason viable options need to be sourced. Similarly, it might be daunting to resource the equipment needed come evaporate water to recover the dissolved salt. Head stands and tea lights can work fine as feasible alternatives.

When delivering out this activity be aware that part insoluble solids space able to form suspensions. This is wherein the particles appear to have actually dissolved, when in truth they have been spread out out throughout the liquid. A good indicator the a suspension has formed is that the liquid will certainly go cloudy or the particles have the right to be heard scraping as the mixture is stirred.

The layout of this task is very prescriptive as the procrebab.netre is set out top top a step by action basis. An open an obstacle activity, with kids working in little groups and also devising their very own methods, would expand the children thinking. Different groups’ suggestions can be compared and also evaluated together a class.

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Additional information

This is a source from thePractical Chemistry project, arisen by the Nuffield structure and the Royal society of Chemistry. This collection of end 200 practical tasks demonstrates a wide selection of chemistry concepts and processes. Each task contains an extensive information because that teachers and also technicians, including complete technical notes and also step-by-step procrebab.netres. Valuable Chemistry activities accompanyPractical PhysicsandPractical Biology.

Health and also safety checked, 2016


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