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Reaction .                 NH3(aq) +   H2O (l)   D NH4+1(aq) + OH-1(aq) 16. Another student says “Adding MgCl2...

Reaction .                 NH3(aq) +   H2O (l)   D NH4+1(aq) + OH-1(aq)

16. Another student says “Adding MgCl2 cannot affect this reaction, because it doesn’t contain any MgCl2 as a reactant or product.” Choose the best answer below (Circle, bold, highlight, italicize one).

  1. The other student is correct. Only chemicals that are contained in the given chemical reaction affect reaction equilibrium. According to Le Chatelier’s principle, the addition of MgCl2 will not cause the reaction to shift left or right.
  2. The other student is incorrect, because the Cl-1 ions react with the NH4+1 ions and cause the concentration of NH4+1 ions to decrease. That can cause the reaction to shift to the left.
  3. The other student is incorrect, because the Mg+2 ions react with the OH-1 ions to form a solid. The solid removes the OH-1 ions from solution, so the reaction shifts right to make more OH-1 ions. If the reaction makes more OH-1 ions it will also make more NH4+1 ions as both are products in the original reaction.
  4. The other student is correct, but not for the stated reason. MgCl2 is a solid and solids are not included in equilibrium reactions.

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