Iron, cobalt, nickel

Questions and tasks

1. What chemical processes occur when obtaining cast iron?

2. What is the essence of convertor and Martin processes of steel obtaining? What chemical processes these methods are based on?

3. Why does the stability of compounds with an oxidation state of + 2 increase, and of those with an oxidation state of + 3 decrease in a range Fe - Co - Ni?

4. Write the equations of the chemical reactions, which proceed when iron corrodes.

5. How do iron, cobalt and nickel react with sulfuric and nitric acids?

6. By what reactions is it possible to obtain oxides and hydroxides of iron (II), cobalt (II) and nickel (II)? Describe their acid-base properties.

7. Compare the composition and stability of ammonia and cyanide complexes of iron (II), cobalt (II) and nickel (II). 8. By what reactions is it possible to obtain oxides and hydroxides of iron (IІI), cobalt (ІII) and nickel (ІII)? Describe their acid-base properties.

9. What volume of chlorine at the temperature of 0° and at the pressure of 101,3 kPa is necessary to oxidise 1 ton of 24% potassium hexacyanoferrate (II) solution?

10. What oxidation state is the most stable in ordinary compounds and in complexes: а) of iron, b) of cobalt with strong field ligands?

11. Why is iron (ІІІ) iodide not obtained? Give the equation of the chemical reaction, which will proceed when mixing the relevant solutions.

12. How is potassium ferrate obtained? How does it react with sulfuric acid? Give the equations of the relevant reactions

Дата добавления: 2015-07-25