Item #: AP6354
With the Analysis of Aluminum Potassium Sulfate Classic Lab Kit for AP® Chemistry, students analyze aluminum potassium sulfate using different techniques to determine its exact composition and gain experience in gravimetric determination.
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Classic AP Requirement #2—Determination of the Percentage of Water in a Hydrate
Students analyze aluminum potassium sulfate (alum) using three techniques to determine its exact composition. The following properties are determined: melting point, the moles of hydrated water per mole of alum and the percent sulfate in the compound. Each of these determinations is compared to the literature or calculated values for alum. Students will gain valuable experience with the analytical process and techniques of gravimetric determinations.
Complete for 24 students working in pairs.
Analysis of Aluminum Potassium Sulfate Inquiry Guidance & AP® Chemistry Curriculum Alignment Transition Guide available! Follow the link in Resources to find this valuable publication that lets you adapt this classic AP Chemistry experiment for guided-inquiry and correlate with the AP Chemistry curriculum framework.
Materials Included in Kit:
Aluminum potassium sulfate, 100 g
Barium nitrate solution, 0.2 M, 400 mL, 2
Additional Materials Required (for each lab group): Mortar and pestle, 0.001-g precision balance (shared), beakers, Thiele melting point tubes (optional), Bunsen burners, capillary tubes, crucibles and covers, drying oven (shared), filter funnels, filter paper (fine-grained, quantitative), graduated cylinders, hot plates, ring stands, rings, wire gauzes, rubber bands, rubber policemen, stirring rods, stoppers to hold thermometers, thermometers, pipe stem triangles, universal clamps, wash bottles with distilled water, watch glasses.
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Correlation to Next Generation Science Standards (NGSS)†
Science & Engineering Practices
Planning and carrying out investigations
Analyzing and interpreting data
Using mathematics and computational thinking
Disciplinary Core Ideas
MS-PS1.B: Chemical Reactions
HS-PS1.B: Chemical Reactions
Energy and matter
Scale, proportion, and quantity
Cause and effect
MS-ETS1-2: Evaluate competing design solutions using a systematic process to determine how well they meet the criteria and constraints of the problem.
MS-ETS1-3: Analyze data from tests to determine similarities and differences among several design solutions to identify the best characteristics of each that can be combined into a new solution to better meet the criteria for success.