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Chapter 20: Problem 70

One of the classic methods for the determination of the manganese content in steel involves converting all the manganese to the deeply colored permanganate ion and then measuring the absorption of light. The steel is first dissolved in nitric acid, producing the manganese(II) ion and nitrogen dioxide gas. This solution is then reacted with an acidic solution containing periodate ion; the products are the permanganate and iodate ions. Write balanced chemical equations for both of these steps.

Short Answer

Expert verified
Dissolution of steel in nitric acid: \(Mn (s) + 2HNO_3 (aq) \rightarrow Mn^{2+} (aq) + 2NO_2 (g) + H_2O (l) \) Reaction between manganese(II) ion and acidic periodate solution: \( 2Mn^{2+} (aq) + 5IO_4^{-} (aq) + 16H^+ (aq) \rightarrow 2MnO_4^{-} (aq) + 5IO_3^{-} (aq) + 8H_2O (l) \)

Step by step solution

01

Identify the reactants and products

In this step, the reactants are steel (assuming pure manganese for simplicity) and nitric acid. The products will be manganese(II) ion and nitrogen dioxide gas. The balanced equation will be: \(Mn (s) + 2HNO_3 (aq) \rightarrow Mn^{2+} (aq) + 2NO_2 (g) + H_2O (l) \) Step 2: Reaction between manganese(II) ion and acidic periodate solution
02

Identify the reactants and products

In this step, the reactants are manganese(II) ion and acidic periodate solution (IO4- ion). The products are permanganate (MnO4-) ion and iodate (IO3-) ion. The balanced equation will be: \( 2Mn^{2+} (aq) + 5IO_4^{-} (aq) + 16H^+ (aq) \rightarrow 2MnO_4^{-} (aq) + 5IO_3^{-} (aq) + 8H_2O (l) \)

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Most popular questions from this chapter

The complex ion \(\mathrm{PdCl}_{4}^{2-}\) is diamagnetic. Propose a structure for \(\mathrm{PdCl}_{4}^{2-}\)

Name the following complex ions. a. \(\mathrm{Ru}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}^{2+}\) b. \(\mathrm{Fe}(\mathrm{CN})_{6}^{4-}\) c. \(\mathrm{Mn}\left(\mathrm{NH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}\right)_{3}^{2+}\) d. \(\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{NO}_{2}^{2+}\) a. \(\mathrm{Ru}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}^{2+}\) b. \(\mathrm{Fe}(\mathrm{CN})_{6}^{4-}\) c. \(\mathrm{Mn}\left(\mathrm{NH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}\right)_{3}^{2+}\) d. \(\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{NO}_{2}^{2+}\)

Name the following coordination compounds. a. \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{2}\) b. \(\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{I}_{3}\) c. \(\mathrm{K}_{2}\left[\mathrm{PtCl}_{4}\right]\) d. \(K_{4}\left[P_{t} C l_{6}\right]\) e. \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2}\) f. \(\left[\operatorname{Co}\left(\mathrm{NH}_{3}\right)_{3}\left(\mathrm{NO}_{2}\right)_{3}\right]\)

Draw all geometrical isomers of \(\mathrm{Pt}(\mathrm{CN})_{2} \mathrm{Br}_{2}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2} .\) Which of these isomers has an optical isomer? Draw the various optical isomers.

The wavelength of absorbed electromagnetic radiation for \(\mathrm{CoBr}_{4}^{2-}\) is \(3.4 \times 10^{-6} \mathrm{m} .\) Will the complex ion \(\mathrm{CoBr}_{6}^{4-} \mathrm{ab}\) sorb electromagnetic radiation having a wavelength longer or shorter than \(3.4 \times 10^{-6} \mathrm{m} ?\) Explain.
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