1. why is it not necessary to test the reactivity of the elemental metals with s

Question

1. why is it not necessary to test the reactivity of the elemental metals with solutions of the same metal ion? To illustrate your explanation, write the equation for the potential chemical reaction using one of the metals studied in this lab

2. some metals form crusty oxide layers that can flate off to expose clean metal surfaces to moisture and air. Other metals form oxide layers that are durable and relatively impermeable. Use this fact to explain why aluminium, a more active metal than iron, is less susceptible to corrosion.

Explanation / Answer

1) If elemental metal is same as the metal ion present in the solution then during the reaction the elemental
metal cannot displace the metal ion in the solution, hence there will be no reaction.
Cu2+ + Cu(NO3)2 -----------> NR
2) The surface on iron is oxidized and later the rusted surface falls off exposing the clean surface to
  more oxidation while aluminium forms a oxide layer which protects the layers beneath. Hence
  aluminium, a more active metal than iron, is less susceptible to corrosion.

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