The acid-base reaction was identified knowing that compounds containing OH are bases and compounds with H+ are considered acids. The reactions were also identified as metatheses because "the bimolecular reaction involves only two reactants" (during the reactions it was observed that when potassium aluminum hydroxide was mixed with sulfuric acid, the transparency of the mixture changed from clear to opaque and the consistency of the mixture was described as being slurry-like. The mixture had to be heated on a hot plate in order to avoid premature formation of solids while the acid. Sulfuric acid was further added After being heated, the consistency of the mixture was liquefied than before without the presence of almost solid material. The final reaction took place when alum crystals formed when the products of both reactions. previous reactions reacted with each other, potassium sulfate in the second reaction, aluminum sulfate in the third reaction and water from both reactions became the reactants used in the final alum reaction.