AQA A Level Chemistry复习笔记8.2.9 Reactions of Metal-Aqua Ions

• In this practical activity, test tube reactions of copper(II), iron(II), iron(III) and aluminium ions with three bases are investigated
• 10 drops of the metal-aqua ion are added to a clean dry test tube
• 10 drops of 1.0 mol dm-3 sodium hydroxide solution are added, the test tube shaken and any observations noted
• A further 10 drops of the base are added so that the base is in excess and any additional observations are recorded
• The procedure is repeated with 1.0 mol dm-3 ammonia solution and then 1.0 mol dm-3 sodium carbonate solution

The reactions of metal-aqua ions with bases table

• It is important to use the correct vocabulary in your observations when referring to solutions and precipitates as well as mentioning further changes on addition of an excess reagent
• Some changes take place over the course of a few minutes so its best not to dispose of the contents of test tubes right away, but return to them for another look
• The identities of the precipitates and the equations for the reactions are covered in a previous section on metal-aqua ions