Alum postlab essay final - Sydney Adams Synthesis of an Alum Introduction In the following lab potassium hydroxide(KOH aluminum(Al and sulfuric

Alum postlab essay final - Sydney Adams Synthesis of an...

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Sydney Adams Synthesis of an Alum Introduction In the following lab, potassium hydroxide (KOH), aluminum (Al) and sulfuric acid (H SO ) were combined together to form alum crystals. Alum crystals are used to purify pipe water, as a food preservative, in medicine and cosmetics, and in the pickling process of certain foods. The purpose of this lab was to practice writing an experimental procedure in a formal manner, to learn how to perform a gravity filtration, to practice making decisions about when a chemical reaction is complete, and to consider the identity and significance of a limiting reactant. Procedure First, .901 grams of aluminum foil was weighed on a scale, cut up into small pieces, and placed into a 250 milliliter beaker. 50.0 milliliters of 1.40 M potassium hydroxide (KOH) was measured and poured into the beaker with the aluminum. A bunsen burner was set up and lit, and an iron ring stand was set up high enough to only lightly heat the beaker. The solution was heated until the gas stopped. Once the heating process was complete, a funnel and a piece of filter paper was used to collect the remaining solids. The filter used a 125 milliliter Erlenmeyer flask. The flask was then put into an ice
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