Which best demonstrates an example of the common ion effect?
duction
A The compound CuCl is 500 times less soluble in sea water than it is in
pure water.
ту
B Ammonia is produced commercially when an increase in pressure
shifts the equilibrium toward the product.
ompounds
C A lighted splint goes out in air but bursts into flame when plunged into
pure oxygen.
D The decomposition of carbonic acid in water occurs spontaneously
whereas the combination of carbon dioxide and water does not.

Question

aalonsor aalonsor

28-06-2020
Chemistry

contestada

Which best demonstrates an example of the common ion effect?
duction
A The compound CuCl is 500 times less soluble in sea water than it is in
pure water.
ту
B Ammonia is produced commercially when an increase in pressure
shifts the equilibrium toward the product.
ompounds
C A lighted splint goes out in air but bursts into flame when plunged into
pure oxygen.
D The decomposition of carbonic acid in water occurs spontaneously
whereas the combination of carbon dioxide and water does not.

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kobenhavn kobenhavn · Answer 1 · 2020-07-03T04:01:58+02:00

Answer: A. The compound CuCl is 500 times less soluble in sea water than it is in pure water.

pure water.

Explanation:

Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.

This principle states that if there is any change in a equilibrium reaction, the equilibrium will shift in a direction so as to minimize the effect.

Thus when a common ion is introduced to an equilibrium reaction, the equilibrium will shift in a direction where the concentration of common ion is decreasing.

[tex]CuCl\rightleftharpoons Cu^++Cl^-[/tex]

[tex]NaCl\rightarrow Na^++Cl^-[/tex]

When common ion such as [tex]Cl^-[/tex] from NaCl in sea water is introduced to an equilibrium reaction, the equilibrium will shift in a direction where the concentration of common ion is decreasing i.e. in the left side and thus solubility of CuCl further decreases.