A buffering solution is made from acetic acid (CH3CO2H) and its conjugate base (CH3CO2-). Which reaction describes the buffering effect of the solution when an acid is added to the solution?
a. CH3CO2H (aq) + OH (aq) → CH3CO2 - (aq) + H2O (l)
b. CH3CO2 - (aq) + H2O (l) → CH3CO2H (aq) + OH (aq)
c. CH3CO2H (aq) → CH3CO2 - (aq) + H + (aq)
d. CH3CO2 - (aq) + H + (aq) → CH3CO2H (aq)
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