Preparation and Properties of Hydroxides

Iron(n) Hydroxide. Prepare 200 ml of water containing no dissolved oxygen. To do this, boil distilled water for 5-10 minutes while passing carbon dioxide through it, and then cool the water in a stream of carbon dioxide to room temperature. Close the mouth of the flask with a stopper. 

Using this water, dissolve several crystals of Mohr s salt (what is its composition ) in a test tube, acidify the solution with sulphuric acid, and put a few pieces of iron into it (for what purpose ). Prepare a sodium hydroxide solution in another test tube. By adding the alkali solution to that of the Mohr s salt, prepare a precipitate of iron(II) hydroxide. What is its colour What happens to it in the air Write the equations of the reactions. 

Perform a similar experiment, using iron(II) sulphate and alkali solutions at hand in the laboratory. Compare and explain the results obtained. 

Iron(IH) Hydroxide. Prepare iron(IIl) hydroxide and study its reaction with an acid and an excess of an alkali. Write the equations of the reactions. 

Which of the hydroxides—iron(II) or iron(III)—has stronger basic properties and how can this be explained  

---