Solution X contains the compound [Cu(H2O)6]SO4[\text{Cu}(\text{H}_2\text{O})_6]\text{SO}_4[Cu(H2O)6]SO4.
State the type of bonding between the oxygen and hydrogen atoms in the water ligands of this compound.
State why the sulfate ions in this compound are not considered to be ligands.
Concentrated hydrochloric acid (reagent Y) was added to a sample of solution X to form a yellow-green solution Z. Identify reagent Y and write an ionic equation for the reaction that occurs when solution X is turned into solution Z.
Aqueous sodium carbonate was added to another sample of solution X to form a blue-green precipitate W. Identify the blue-green solid W.
Explain why colorimetry cannot be used to determine the concentration of solutions containing [Sc(H2O)6]3+[\text{Sc}(\text{H}_2\text{O})_6]^{3+}[Sc(H2O)6]3+. In your answer, refer to the electron configuration of the metal ion.