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3) Pb(NO3)2(aq) + 2 K I(aq) à PbI2(s) + 2 KNO3(aq) Station 5: 1) Acid-base reactions take place almost instantaneously, as demonstrated by the reaction in this station. 2) It takes amore time for the medicine to be absorbed through the stomach lining and travel through the bloodstream than it does for a base to directly neutralize an acid. 112 3)