Describe how ligands with lone pairs form coordination bonds to a transition element cation to give a complex ion, and deduce the charge on a complex from the oxidation state of the metal and the charges of the ligands, or the reverse.
Tę umiejętność sprawdza 16 zadań wzorowanych na arkuszach IB z lat 2023–2026.
The copper(II) ion, Cu2+, forms a variety of coloured complexes. (i) Outline, with a reason, why solutions containing [Cu(H2O)6]2+ ions are blue. Use section 15 of the data booklet. (ii) State the type of bond between the copper(II) ion and…
Outline what type of bond joins a ligand to the nickel ion and how this bond forms.
What is the charge on this complex ion of chromium(III), [Cr(H2O)4Cl2]×? A. 1+ B. 3+ C. 5+ D. 1-
The cyanide ion acts as a ligand in many complex ions, for example hexacyanoferrate(III), [Fe(CN)6]3−. (i) State the type of bond, as precisely as possible, that joins each cyanide ion to the iron ion. (ii) Deduce the oxidation state of iron in…
Which statements are correct for the complex ion [CoCl4]2−? I. The oxidation state of cobalt is +4. II. The chloride ions act as Lewis bases. III. The coordination number of cobalt is 4. A. I and II only B. I and III only C. II and III only D. I, II…
What is the oxidation state of chromium in the complex [Cr(NH3)4Cl2]Cl? A. +1 B. +2 C. +3 D. +7
Chloride ions can act as ligands towards transition metal ions. Three compounds of chromium that differ in the number of chloride ions bonded directly to the chromium ion have the formulas and colours shown. (i) Deduce the charge of the complex ion in…
Which term cannot describe the chloride ion, Cl−? A. Lewis base B. ligand C. Brønsted–Lowry acid D. nucleophile
What is the oxidation state of platinum in the complex ion [PtCl5(NH3)]−? A. +1 B. +2 C. +3 D. +4
The nitrite ion, NO2−, can form complexes with transition element ions such as Co3+ and Ni2+. Describe the type of bonding between the nitrite ion and the metal ion in such a complex, and state the role of the nitrite ion in acid-base…
Copper(II) ions can be removed from waste water by chelation. A possible ligand is the nitrilotriacetate anion, shown. Identify the atoms in the ligand that form coordination bonds with a copper(II) ion when it forms a complex ion.
A pale blue solution of [Cu(H2O)6]2+ turns deep blue when aqueous ammonia is added in excess and the complex ion [Cu(NH3)4(H2O)2]2+ forms. Which factor explains the change in colour? A. Charge on the metal ion B. Number of d electrons in the…
Nickel forms the chloride NiCl2. (i) State the full electron configuration of the nickel(II) ion, Ni2+. (ii) In aqueous solution nickel(II) ions exist as [Ni(H2O)6]2+, which is green. Describe the interaction between the nickel ion and a…
Glycine, H2NCH2COOH, loses a proton from its carboxyl group in alkaline solution to form the glycinate ion. The glycinate ion can bond to a copper(II) ion through two of its atoms, so it acts as a bidentate ligand. Explain how a glycinate ion bonds to a…
Which solutions would show a wavelength of maximum absorbance different from that of 0.10 mol dm−3 CuSO4(aq)? I. 0.010 mol dm−3 CuSO4 II. 0.10 mol dm−3 Cu(NO3)2 III.…
The wavelength of maximum absorbance of an aqueous solution of 0.10 mol dm−3 CuSO4 is measured. Which aqueous solutions would have a different wavelength of maximum absorbance? I. 0.050 mol dm−3 Cu(NO3)2 II.…
Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.