Explain the impact that changing pressure has on a system in a state of dynamic equilibrium. What will happen when pressure on a reaction mixture at equilibrium and with fewer moles on the reactant side is increased?

The reverse direction is favored; formation of reactants.

Explanation:

Hello,

In this case, when the chemical reactions are being carried out in gaseous phase, the pressure has a significant effect if the number of moles of reactants differ from those of the products favoring the equilibrium towards the direction having the fewer amount of moles.

In such a way, if the moles of the reactants are less than those of products, increasing the pressure will reverse the reaction towards reactants again as equilibrium shall be reestablished.

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nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.