Question

Give formulas for the following. a. potassium tetrachlorocobaltate(II) b. aquatricarbonylplatinum(II) bromide c. sodium dicyanobis(oxalato)ferrate(III) d. triamminechloroethylenediaminechromium(III) iodide

Short answer

The chemical formulas for the given compounds are: a. \(K_2[CoCl_4]\) b. \([Pt(CO)_3(H_2O)]Br_2\) c. \(Na_3[Fe(CN)_2(C_2O_4)_2]\) d. \([Cr(NH_3)_3Cl(en)]I_3\)

Step-by-step solution

Identify the cation and anion

The cation in this compound is potassium (K^+), and the anion is tetrachlorocobaltate(II) (Co^2+ with four chloride ions, Cl^-).

Write the chemical formula

To balance the charges, we need two potassium ions for each tetrachlorocobaltate ion. The resulting chemical formula is \(K_2[CoCl_4]\). b. aquatricarbonylplatinum(II) bromide:

Identify the cation and anion

The cation in this compound is aquatricarbonylplatinum(II) (Pt^2+ with three CO ligands and one H2O ligand) and the anion is bromide (Br^-).

Write the chemical formula

To balance the charges, we need one bromide ion for each aquatricarbonylplatinum ion. The resulting chemical formula is \([Pt(CO)_3(H_2O)]Br_2\). c. sodium dicyanobis(oxalato)ferrate(III):

Identify the cation and anion

The cation in this compound is sodium (Na^+) and the anion is dicyanobis(oxalato)ferrate(III) (Fe^3+ with two CN ligands and two oxalate ligands C2O4^2-).

Write the chemical formula

To balance the charges, we need three sodium ions for each dicyanobis(oxalato)ferrate ion. The resulting chemical formula is \(Na_3[Fe(CN)_2(C_2O_4)_2]\). d. triamminechloroethylenediaminechromium(III) iodide:

Identify the cation and anion

The cation in this compound is triamminechloroethylenediaminechromium(III) (Cr^3+ with three NH3 ligands, one Cl^- ligand and one ethylenediamine ligand (en)) and the anion is iodide (I^-).

Write the chemical formula

To balance the charges, we need three iodide ions for each cationic complex ion. The resulting chemical formula is \([Cr(NH_3)_3Cl(en)]I_3\).