If the ph of a buffer solution is equal to the pka of the acid in the buffer then

This means that there are equal amounts of protonated and deprotonated forms of the acid.

Explanation:

For example if pH =5 and pKa= 5 it means it is 50% protonated and 50% deprotonated

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation:

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