The Test on Salt Preparations

Topics: Water, Chemistry, Nitric acid Pages: 3 (766 words) Published: July 27, 2013
I. AIM AND THE INTRODUCTION OF THE EXPERIMENT

The main aim of this experiment is to prepare and collect a sample of pure, dry and shiny lead (II) iodide by the given substances. To obtain such a sample, we need to conduct several processes. As we all know, salt can be prepared by using several methods, which depends on its solubility in water. These methods are precipitation, titration, and the action of acid on insoluble base or insoluble carbonate or metal. Aside from our main objective, we also have a secondary aim. We would like to apply what we have learnt in class about chemistry, regarding salt preparation in particular. This experiment would then help us to visualize the process even better. Salts are very commonly and widely used chemical compounds. They can be obtained by reacting acids with basic metals, metal oxides, metal hydroxides, or by neutralization of acids and bases.

II. DESCRIPTION OF THE GENERAL IDEA
Salts which are insoluble in water, can be prepared by the precipitation method which is when two clear liquids are mixed together and a reaction between them produces a solid precipitate, which is insoluble in water. Since lead (II) Iodide is insoluble in water, we would be using this precipitation method. From the given substances, we would not be able to prepare Lead (II) Iodide directly. First of all, we must react solid lead oxide with aqueous nitric acid. The balanced chemical equation of this reaction would be: PbO(S) + 2HNO3 (aq) Pb (NO3)2(aq) + H2O (l)

After we obtain the Lead (II) Nitrate, we then would be able to prepare Lead Iodide by reacting it with aqueous potassium iodide by the given chemical calculation: Pb (NO3)2 (aq) + 2KI (aq) PbI2 (s) + 2KNO3 (aq)

III. Equipment needed
* 1 Measuring cylinder
* 1 beaker 100 ml
* 1 wire gauze
* 1 tripod stand
* 1 Bunsen burner with rubber tube
* 1 filter funnel
* 3 pieces of filter paper
* 2 conical flasks
* 1 spatula...
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