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

This is a an extremely straightforward experiment. It can be brought out personal or in groups of two. Pupils must stand up during heating activities and beware of hot salt spitting when evaporation is nearly complete.

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


Mixture the sand and also sodium chloride (salt), about 6–7 g per team of college student (asuitable sand–salt mixture should contain approximately 20% salt by mass)

Health, safety and technical notes

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


Pour the sand–salt mixture right into the beaker so that it simply covers the base.Add about 50 cm3of water, or add water until the maker is around 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 solution gently till it starts to decrepitate (spit).CARE:Keep eye security on and also do not gain too close.Turn turn off the Bunsen burner and also let the damp salt dry in the dish.
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Source: Royal society of Chemistry

Equipment for a course experiment to separate a mixture of sand and also salt.

Teaching notes

If desired, the experiment have the right to be extended to isolate dry samples that sand and also salt. To execute this, the damp sand in the filter document can be transferred to another sheet of dried filter paper, and, by folding and dabbing, the sample have the right to be dried. If necessary, an additional piece the filter record can it is in used.

Students frequently like to existing their specimens in little bottles for approval, therefore a spatula can be provided to accomplish this. If the first student the a pair is transferring the sand, the other can be scraping the dried salt native the evaporating dish and transferring it to one more specimen bottle.

If this expansion is lugged out, the students must be encouraged to label the bottles. They have to be told the all samples prepared in this way need to it is in labelled, even if in this case, it must be evident which problem is which.

Student questions

Why deserve to sand and salt be separated making use of this experiment?Why is the salt, sand and water mixture stirred in action 3?Why is the salt equipment heated in action 6?How can the last traces that water be gotten rid of from her samples come ensure that they are totally dry?Give two reasons why the sand you have obtained might still be contaminated through salt.How can you it is adapted your experiment to achieve a purer sample of sand?Give two reasons why the salt you have actually obtained could still be contaminated v sand.How could you adapt your experiment to obtain a purer sample the salt?

Primary science teaching notes

If friend teach primary science, the complying with information is designed to aid you usage this resource.

Skill development

Childrenwill build their functioning scientifically an abilities by:

Drawing conclusions and raising more questions that might be investigated, based upon their data and also observations.Using ideal scientific language and also ideas come explain, evaluate and also communicate your methods and findings.

Learning outcomes

Children will:

Observe the some products will dissolve in liquid to form a solution.Describe just how to recoup a problem from a solution.Use understanding of solids, liquids and gases to decide exactly how mixtures might be separated, including through filtering, sieving and also evaporating.Demonstrate that dissolving, mixing and also changes the state space reversible changes.

Concepts supported

Children will certainly learn:

That there are various techniques that can be used to separate various mixtures.That dissolve is a reversible reaction.That no all solids are soluble.That the rate of dissolving have the right to be impacted by miscellaneous factors.That melting and dissolving are not the same process.

Suggested activity use

This activity can be supplied as a whole-class investigation, with youngsters working in little groups or pairs to watch at just how to separate the salt and also sand. This could carry out a stimulus for more investigations feather at just how to separate other mixtures of solids, one of two people of different particle size or through solubility.

Practical considerations

Primary schools often don’t have actually Bunsen burners, for this reason viable options need to be sourced. Similarly, it may be complicated to resource the equipment needed come evaporate water to recoup the liquified salt. Head stands and also tea lights have the right to work well as possible alternatives.

When moving out this activity be conscious that part insoluble solids room able to form suspensions. This is whereby the particles show up to have dissolved, once in truth they have been spread out throughout the liquid. A great indicator that a suspension has created is that the liquid will go cloudy or the particles have the right to be heard scraping together the mixture is stirred.

The layout of this activity is an extremely prescriptive as the procubraintv-jp.comre is set out ~ above a step by step basis. One open difficulty activity, with kids working in little groups and devising their very own methods, would prolong the children thinking. Various groups’ suggestions can be compared and 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 culture of Chemistry. This arsenal of end 200 practical activities demonstrates a wide variety of chemical concepts and processes. Each activity contains substantial information for teachers and technicians, including complete technical notes and also step-by-step procubraintv-jp.comres. Practical Chemistry activities accompanyPractical PhysicsandPractical Biology.

Health and safety checked, 2016


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