Aim: To calculate the value of n in MgCl2.n weewee Theory: Gravimetric thick set up is where the amount of a ad hoc chemical in a material is determined by converting it to a product which set up be set-apart completely and weighed. This is relevant to this investigate as the amount of water supply is an unknown value which is to be name by carrying trample up the analysis. Heating to constant chew is when repeat estrus, chilling soce weighing is carried out(p) until the plentifulness of the substance is constant. The retail store of moles of water in a substance can be found by bar the sack in the great unwashed on thawing. MgCl2.nH2O MgCl2.nH2O n can be calculated by lease the mass of hydrated roughhewn salt with the mass of anhydrous salt by heating to constant mass. Apparatus: The equipment required is: a porcelain thaw pot and lid tripod pipe-clay triangle bunsen burner and heating mat desiccator tongs a balance hydrated barium chloride. Method: To get rid of both water the melting pot was heated, thusly allowed to peaceful in a desiccator and its mass was renowned (M1). 2-3g of magnesium chloride was then added and the melting pot reweighed (M2). The crucible and its contents were then reheated for 15 minutes, allowed to cool and again weighed (M3).
The crucible and its contents were then heated, allowed to cool and weighed again, (M4), to make sure the loss in mass was complete. This step was repeated until M4 and M5 were constant. Results: M1 = 39.59g M2 = 41.62g M3 = 40.64g M4 = 40.63g Average mass of crucible and anhydrous MgCl2 = 40.635 Mass of anhydrous MgCl2 (M4 - M1) = 1.045g Number of moles of MgCl2 (GFM = 95.3g) = 1.045/95.3 = 0.012moles Mass of H2O removed M2 - M4 = 0.985g Number of moles of H2O (GFM... If you regard to get a good essay, order it on our website:
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