On the basis of Chlorides, Sulphates and Nitrates of Pb, Cu, Zn and Fe make as many displacement reactions as possible?
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Answer:
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activity series of the four metals used
There are many ways of carrying out this series of reactions. The one described here uses a spotting tile but the same procedure could be adapted for use with test tubes. The advantages of the spotting tile method include:
very small quantities of chemicals are used.
the whole set of experiments is displayed together, making comparison easier.
clearing-up afterwards is simple and avoids metal deposits being left in sinks.
Careful thought needs to be given to distribution of the chemicals to the class. Solutions could be distributed in test tubes, or in small bottles fitted with droppers for sharing between several pairs of students. Metals could be issued in sets. The teacher should keep control of the magnesium ribbon, dispensing short lengths when required.
There should be no flames alight so that students are not tempted to burn pieces of magnesium and the teacher should be alert to the possibility of pieces of magnesium being removed from the laboratory.