Hello Essay

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Separating a MixtureAim:To carry out a gravimetric analysis of a mixture of …. and ….. to estimate the percentage of each component present in the mixture.Materials:wash bottle, safety goggles, Bunsen burner, tripod, filter ring, electronic balanceJustify use of materials:Filter paper - salt is soluble and sand is insoluble. Hence, the dissolved salt pass through the filter paper, sand trapped due to larger particle size.Evaporating Basin - filtrate of dissolved salt and water can be separated - a salt has a higher boiling point than water, resulting in salt being left behind in the evaporating basinIndependent Variable:Amount of salt and sand (components of the mixture)Dependant Variable:The mass of each componentControlled Variables:Electronic balance, evaporating basin, filter paper, heating from the Bunsen burnerRisk AnalysisBunsen burnerRisk: burning of skin and hairDescribe precaution:be careful around the flame - to prevent skin from getting burns ,tie back hair -- to prevent hair from catching on fireEvaporating BasinRisk: spitting of salt onto skin and into eyesDescribe precaution:Controlling heat from Bunsen burner - to prevent salt from spittingWear safety goggles - to prevent hot salt from getting into eyesGlasswareRisk: Glass ware breakingDescribe precaution:Be careful with glassware and don't place near edge of benches - prevent broken glass cutting skinMethod:Making the mixtureObtain mixture of sand and saltWeigh the mixtureAdd 30ml of water and stir using a glass rod until salt is thoroughly dissolved.Separating the MixtureSet up the apparatus as shown in the diagram belowWeigh the filter paper and evaporating basin and record the mass.Weigh …. g of the mixture, transfer to a 250ml beaker and add …. ml of water using a 50ml measuring cylinder. Stir to dissolve salt.Pour mixture through filter paper, washing excess …. (mixture) from the beaker using a wash bottle.Place filter paper on a watch glass and then place into oven and dry to a constant mass. Record mass of filter paper.Place filtrate in an evaporating basin, and heat gently until the water...

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