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Chapter 21: Problem 37

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

Expert verified
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

01

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^-).
02

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:
03

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^-).
04

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):
05

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-).
06

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:
07

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^-).
08

Write the chemical formula

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

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Most popular questions from this chapter

Hemoglobin (abbreviated \(\mathrm{Hb}\) ) is a protein that is responsible for the transport of oxygen in the blood of mammals. Each hemoglobin molecule contains four iron atoms that serve as the binding sites for \(\mathrm{O}_{2}\) molecules. The oxygen binding is \(\mathrm{pH}\) dependent. The relevant equilibrium reaction is $$\mathrm{HbH}_{4}{ }^{4+}(a q)+4 \mathrm{O}_{2}(g) \rightleftharpoons \mathrm{Hb}\left(\mathrm{O}_{2}\right)_{4}(a q)+4 \mathrm{H}^{+}(a q)$$ Use Le Ch芒telier's principle to answer the following. a. What form of hemoglobin, \(\mathrm{HbH}_{4}^{4+}\) or \(\mathrm{Hb}\left(\mathrm{O}_{2}\right)_{4}\), is favored in the lungs? What form is favored in the cells? b. When a person hyperventilates, the concentration of \(\mathrm{CO}_{2}\) in the blood decreases. How does this affect the oxygenbinding equilibrium? How does breathing into a paper bag help to counteract this effect? (Hint: \(\mathrm{CO}_{2}\) reacts with water to produce carbonic acid.) c. When a person has suffered a cardiac arrest, an injection of a sodium bicarbonate solution is given. Why is this step necessary?

Ammonia and potassium iodide solutions are added to an aqueous solution of \(\mathrm{Cr}\left(\mathrm{NO}_{3}\right)_{3} .\) A solid is isolated (compound \(\mathrm{A}\) ), and the following data are collected: i. When \(0.105 \mathrm{~g}\) of compound \(\mathrm{A}\) was strongly heated in excess \(\mathrm{O}_{2}, 0.0203 \mathrm{~g} \mathrm{CrO}_{3}\) was formed. ii. In a second experiment it took \(32.93 \mathrm{~mL}\) of \(0.100 \mathrm{M} \mathrm{HCl}\) to titrate completely the \(\mathrm{NH}_{3}\) present in \(0.341 \mathrm{~g}\) compound \(\mathrm{A}\). iii. Compound A was found to contain \(73.53 \%\) iodine by mass. iv. The freezing point of water was lowered by \(0.64^{\circ} \mathrm{C}\) when \(0.601\) g compound \(A\) was dissolved in \(10.00 \mathrm{~g} \mathrm{H}_{2} \mathrm{O}\) \(\left(K_{\mathrm{f}}=1.86^{\circ} \mathrm{C} \cdot \mathrm{kg} / \mathrm{mol}\right)\) What is the formula of the compound? What is the structure of the complex ion present? (Hints: \(\mathrm{Cr}^{3+}\) is expected to be sixcoordinate, with \(\mathrm{NH}_{3}\) and possibly \(\mathrm{I}^{-}\) as ligands. The \(\mathrm{I}^{-}\) ions will be the counterions if needed.)

Draw the \(d\) -orbital splitting diagrams for the octahedral complex ions of each of the following. a. \(\mathrm{Zn}^{2+}\) b. \(\mathrm{Co}^{2+}\) (high and low spin) c. \(\mathrm{Ti}^{3+}\)

Oxalic acid is often used to remove rust stains. What properties of oxalic acid allow it to do this?

Compounds of copper(II) are generally colored, but compounds of copper(I) are not. Explain. Would you expect \(\mathrm{Cd}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\) to be colored? Explain.
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