Question

Describe the general procedure for bringing a metal into solution

Answer 1

There are more than one way we can bring a metal into solution. Not all metals cannot goes into solution such as inert or noble metals such as gold, copper, platinum, silver. Only those metals which are chemically reactive can be bring into solution.

1. Electrolysis method: In this method metal rod placed in anode compartment, then by passing electricity or completing the cell metal at anode start dissolve into solution by losing electrons and becomes a positive metal ion.

2. Amalgamation: in this method metal is dissolved in mercury to make it amalgamated. Liquid metals

Na(s) + Hg(l) --> Na-Hg(l)

3. Reaction with water: Some metals especially alkali metals are very reactive towards water and sometimes it will make even an explosion. alkali metals such as sodium and potassium will reacts with water and forms an alkali (hydroxides) and thereby goes into solution.

2Na(s) + 2H₂O(l) --> 2NaOH (aq) + H₂(g)

4. Reaction with acids: alkali and alkaline earth metals almost explosively reacts with acids and forms hydrogen gas and respective salts in solutions.

2Na(s) + 2HCl(aq) --> H₂(g) + 2NaCl

5. Electrochemical reactions: metals with very high negative standard reduction potentials can displace other metals with comparatively lower negative standard reduction potential can replce or displace metal ions in solution.

Li (s) + NaCl (aq) --> LiCl(aq) + Na(s)

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