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Investigation on the "labels on bottles" (Ions testing).

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Introduction

Investigation on the "labels on bottles" (Ions testing) Planning: * There are many ways in which to find out what ions are contained in different compounds. When substance is mixed to make solution, precipitation reactions and reactions with gas specifically are very useful to help us out with identifying which ions are contains in the substances. This test is for negative ions. * Ions can also be identified in a test called "Flame test". Compounds give of different colours when put into flame; a certain ion gives off a certain colour for example when potassium ion is burned, a beautiful calm lilac colour is given off and when sodium ion is burned a bright yellow colour is given off. This way we can identify which ions are present in the compounds. This test is for positive ions. ...read more.

Middle

HCL and placed above blue flame to clean the chrome wire. Repeat this procedure until you observe 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+ = yellow K+ = lilac Cu2+ = Green Fe2+ = Blue/Green Results: 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. ...read more.

Conclusion

Equipment * 2 Test tube * testube rack * delivery tube * bung * lime water * Substance "c" * Dilute hydrochloric acid Safety * Wear jacket and goggles for it may have a vigorous reaction, * keep away from your body * do not look over the test tubes Method: For carbonate ions; Dilute HCL will be poured into a testube with a finger size amount of Substance "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. ...read more.

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