To find the amount of copper in the sample, we first need to determine the moles of EDTA used in the titration. Moles of EDTA = Molarity VolumeMoles of EDTA = 0.050 M 0.025 L = 0.00125 molesIn a titration with EDTA, the stoichiometry between EDTA and the metal ion in this case, copper is usually 1:1. Therefore, the moles of copper in the sample are equal to the moles of EDTA used in the titration.Moles of copper = 0.00125 molesNow, we can find the mass of copper in the sample by multiplying the moles of copper by its molar mass 63.55 g/mol for copper .Mass of copper = Moles of copper Molar mass of copperMass of copper = 0.00125 moles 63.55 g/mol = 0.07944 gSo, there are approximately 0.07944 grams of copper in the 0.100 g sample of the unknown compound.