8: Synthesis of Alum from Aluminum Foil
- Page ID
- 514170
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- Apply stoichiometric principles to calculate theoretical and percent yields.
INTRODUCTION
Alum is a common name for potassium aluminum sulfate dodecahydrate, with the chemical formula \(\ce{K[Al(SO4)2].12H2O}\). It has various applications, including water purification, dyeing, and medicine.
This experiment involves the synthesis of alum from aluminum foil through a series of reactions:
- Reaction with Potassium Hydroxide: Aluminum reacts with potassium hydroxide \(\ce{(KOH)}\) to form a potassium aluminum hydroxide complex and hydrogen gas.
- Neutralization with Sulfuric Acid: Sulfuric acid \(\ce{(H2SO4)}\) is added to neutralize the potassium hydroxide, forming potassium aluminum sulfate.
- Crystallization: The alum is crystallized from the solution by cooling in an ice bath.
The overall reaction for the synthesis of alum is:
\(\ce{2Al(s) + 2KOH(aq) + 4H2SO4(aq) + 22H2O(l) -> 2K[Al(SO4)2].12H2O(s) + 3H2(g)}\)
This experiment also highlights a green application of chemistry, as it utilizes recycled aluminum foil as the starting material.
- 8.1: Synthesis of Alum from Aluminum Foil - Experiment
- This page details safety measures, necessary equipment, and procedural steps for an experiment that synthesizes alum from aluminum foil, potassium hydroxide, and sulfuric acid. Key precautions include wearing protective gear and using a fume hood while handling corrosive chemicals. It describes the preparation and reaction process, as well as crystallization, filtration of the final product, and proper chemical disposal to maintain laboratory safety.
- 8.3: Synthesis of Alum from Aluminum Foil - Data and Report
- This page outlines a laboratory experiment for synthesizing alum using aluminum, potassium hydroxide, and sulfuric acid. It includes sections for recording mass measurements, observations of the reaction phases, and calculations for identifying the limiting reactant and percent yield. Post-lab questions promote critical thinking regarding factors affecting yield, reaction rates, and potential errors. The emphasis is on documenting and analyzing experimental data in chemistry.