Question

Consider the following chemical reaction at equilibrium. H2SO4(aq) Double headed arrow. 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

The compound that has been able to produce the ion common to the product has been Magnesium sulfate. Thus, option C is correct.

The common ion effect has been observed when the addition of a molecule to the solution results in the dissociation of ions that are the same as the product or reactant.

These ions are responsible for the shift in the equilibrium for a chemical reaction.

Which compound cause Common ion effect?

The equilibrium has been the condition when the number of ions of each product and reactant has been equal on the product and the reactant side.

The addition of compounds with products ions results in the shift of equilibrium towards left. The addition of compounds with reactant ions results in the shift in the equilibrium towards right.

The given chemical equation has been:

$\rm H_2SO_4\;\leftrightharpoons\;2\;H^+\;+\;SO_4^2^-$

The ions dissociated by the following compounds has been:

• $\rm NaCl\;\rightarrow\;Na^+\;+\;Cl^-$
• $\rm KNO_3\;\rightarrow\;K^+\;+\;NO_3^-$
• $\rm MgSO_4\;\rightarrow\;Mg^2^+\;+\;SO_4^2^-$
• $\rm FeCl_3\;\rightarrow\;Fe^3^+\;+\;3\;Cl^-$

The compound that has been able to produce the ion common to the product has been Magnesium sulfate. It has been able to increase the concentration of the product and shift the equilibrium towards the left.

Thus, option C is correct.

Learn more about common ion effect, here:

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