Investigation on the labels on bottles Essay Example

the nichrome wire is clean (when purely iron colour from the nichrome wire is given off). Once wire has cooled, dipped it in dilute hydrochloric acid and placed it in the bottle 1 until nichrome wire's end is covered with the compound.

The wire will then be held at the edge of the blue flame, and the flame colour will be observed.Through preliminary work I have got results which tells me what colour contain which ions.Na+ = yellowK+ = lilacCu2+ = GreenFe2+ = Blue/GreenResults:Bottle "A" = Yellow = Na+Bottle "B" = Lilac = K+Bottle "C" = Green = Cu2+At normal: Compound "A":Compound "B": Compound "C":Observations:It is most likely for Compound "a" to contain Sodium ions because the flame given off was bright yellow/orange when put to Bunsen flame; there for we assume it is Sodium chloride.It is most likely for Compound "b" to contain Potassium ions because the flame given off when put to Bunsen flame was Lilac/purple. There for we presume it is Potassium sulphate.

It is most likely for Compound "c" to contain Cu2+ due to the fact that some vague green flames were given off. But on the other hand iron too gives off green/blue flame therefore we need to take other tests to find out what ion it contains.I will have to do another test to detect the ions in the compounds and to prove the results for the previous tests. In order to do this I will do an anion test. I will have to find out whether it is Iron chloride or copper carbonate, so I will do two tests which are only for sulphate ions (SO4-) and carbonate anions (CO3-).Equipment

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Test tube testube rack delivery tube bung lime water Substance "c" Dilute hydrochloric acidSafety Wear jacket and goggles for it may have a vigorous reaction, keep away from your body do not look over the test tubesMethod:For carbonate ions;Dilute HCL will be poured into a testube with a finger size amount ofSubstance "C", immediately it should be covered with a bung, connected to another test tube with limewater, the compound should react giving off a gas, which should change the lime water to a cloudy form.

Results:

We did not have enough lime water there for nothing much really happened to the lime water therefore we are trying another procedure.Method:Observations:Fortunately the red litmus paper did go blue this means that substance "c" contained CO2 and due to the presence of CO2 the red litmus paper turned blue and therefore this means the substance had a carbonate (negative ion). There fore it is a Copper Carbonate.