The reactions of Cu2+ and Zn2+ with EDTA are: Cu2+(aq)+EDTA(aq)Cu-EDTA(aq)Zn2+(aq)+EDTA(aq)ZnEDTA(aq) Two experiments were carried using complexometric titrations. 0.15g of brass was dissolved in acid and transferred to a 100cm3 volumetric flask where it was filled to 100cm3 with deionised water - this is solution A. In one experiment 10cm3 of solution A was titrated against EDTA and the equivalence point was found at a EDTA volume of 22.50cm3. In another experiment, 10cm3 of solution A was used but sodium thiosulfate was added before the titration. The equivalence point for this solution was found at a EDTA volume of 8.50cm3. If the concentration of EDTA was 0.01moldm3, how much copper is in the 0.15g brass sample? The molecular mass of EDTA is 292.24gmol1,Zn is 65.39gmol1 and Cu is 63.55gmol1