Thursday, 19 February 2015

8.1.3 - Laboratory Activity : Preparation of insoluble salts

Laboratory Activity 8.1.3:
Preparation of insoluble salts
Aim: To prepare insoluble lead(II) iodide through precipitation reaction.
» Lead (II) nitrate solution (0.5M)
» Sodium iodide

» Filter funnel
» Glass rod
» Beaker
» Conical flask
» Filter paper

1. 25cm3 of 0.5M of lead solution is added to 25cm3 of 0.5 M sodium iodide solution in a beaker.
2. The mixture is stirred thoroughly with a glass rod. A yellow precipitate is formed immediately.
3. The mixture is filtered to obtain the yellow solids of lead(II) iodide as the residue.
4. The residue is rinsed with distilled water to remove any traces of other ions in it.
5. The yellow solid is dried by pressing between two pieces of filter paper.

The chemical equation for the reaction in the preparation of lead(II) iodide is:
PbNO3(aq) + 2NaCl(aq) → PbCl2(s) + 2NaNO3(aq)
Ionic equation : Pb2+(aq) + 2Cl- → PbCl2(s)

Insoluble salts of lead(II) iodide can be prepared by double decomposition through precipitation reaction.

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