The concentration of copper(II) ions in water near a vineyard is measured by titration with EDTA4-, which forms a 1 : 1 complex:
[Cu(H2O)6]2+ + EDTA4- → [Cu(EDTA)]2- + 6H2O
EDTA4- is a multidentate ligand. Explain the term multidentate ligand, with reference to this reaction.
[2]
A 25.0 cm3 sample of the water reacted with 18.0 cm3 of 1.00 × 10-3 mol dm-3 EDTA4-. Calculate the concentration of Cu2+ in the water.
[2]