Question

H2SO4(aq) mc011-1.jpg 2H+(aq) + SO42–(aq) The addition of which compound will cause a shift in equilibrium because of a common ion effect?

NaCl
KNO3
MgSO4
FeCl3

Answer 1

Answer: C

Step-by-step explanation:

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Answer 2

Answer: The addition of
`MgSO_4` will cause a shift in the given equilibrium equation.

Step-by-step explanation: We are given a chemical equation:

`H_2SO_4(aq.)\rightleftharpoons 2H^+(aq.)+SO_4^(2-)(aq.)`

Common ion effect is the effect seen when there is an addition of one common ion to the equilibrium conditions and it effects the equilibrium to counteract the effect of addition.

In the given equilibrium,
`MgSO_4` will cause a shift in the equilibrium because of the presence of
`SO_4^(2-)` ions in both the reactions.

Ionization of
`MgSO_4` is given by:

`MgSO_4(aq.)\rightleftharpoons Mg^(2+)(aq.)+SO_4^(2-)(aq.)`

As the
`SO_4{2-}` ions are added to the right side, so to counteract the effect of this, the equilibrium will shift in the left direction that is the reaction will proceed in the backward direction.