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Advanced Higher Chemistry Unit 2-PPA-1: "Complexometric Determination of Nickel using EDTA" By Gordon Walker Introduction: Equation of the reaction: The aim of this experiment is to determine the percentage of nickel present in hydrated nickel sulphate, by Complexometric titration with ethylenediaminetetraacetic acid (EDTA). The aim will be carried out using a basic Complexometric titration of EDTA into a solution of nickel sulphate, until the equivalence point is reached i.e. when a colour change is observed. EDTA is a substance used successfully as a lignant, and this is due to its structure in alkaline conditions (which can be seen in figure 1.1). As a consequence of its structure the EDTA is able to form stable complexes with metal ions such as nickel, because it has the capacity to accept other ions (in this case Ni ), as seen in figure 1.2. The percentage of nickel in nickel ( ) sulphate (NiSO .6H O), is given by...

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