Solution X contains the compound [Co(H2O)6]Cl2[\text{Co}(\text{H}_2\text{O})_6]\text{Cl}_2[Co(H2O)6]Cl2.
State the type of bonding between the oxygen and hydrogen atoms in this compound.
State why the chloride 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 deep blue 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 pink solid W. Identify the pink solid W.
Explain why colorimetry cannot be used to determine the concentration of solutions containing [Zn(H2O)6]2+[\text{Zn}(\text{H}_2\text{O})_6]^{2+}[Zn(H2O)6]2+. In your answer, refer to the electron configuration of the metal ion.
63 exam-style questions on AQA A Level Chemistry Transition metals (A-level only), covering General properties of transition metals (A-level only), Substitution reactions (A-level only), Shapes of complex ions (A-level only), Formation of coloured ions (A-level only), Variable oxidation states (A-level only), and Catalysts (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.