Dilutions Mini-Lab

Evaluation/Assessment: Objective: Today I will be able to: Dilute a stock solution to the correct molarity Calculate the molarity for each component in a solution. Evaluation/Assessment: Informal assessment – monitoring student progress as they complete the practice worksheets and the dilutions lab Analyzing student responses to the practice, lab and exit ticket Common Core Connection Make sense of problem and persevere in solving them Attend to precision Look for and express regularity in repeated reasoning

Lesson Sequence Evaluate: Warm – Up Engage: Solutions Demo Engage, Explore and Elaborate: Dilutions Mini-Lab Elaborate: Molarity, Molality, Mole Fraction Practice Evaluate: Exit Ticket

Warm - Up When dissolving a solute in a solvent, how could you maximize the quantity of solute dissolved?

Objective Today I will be able to: Dilute a stock solution to the correct molarity Calculate the molarity for each component in a solution.

Homework Finish Practice Problems

Agenda Warm-Up Dilutions Demo Dilutions Mini-Lab Molarity, Molality, Mole Fraction Practice Exit Ticket

Watch Ms. Ose’s technique for preparing and diluting a solution Dilutions Demo Watch Ms. Ose’s technique for preparing and diluting a solution

Review: What technique is used to prepare a solution? Dilutions Mini-Lab Purpose: To practice technique for preparing a stock solution and then diluting it Review: What technique is used to prepare a solution?

Lab Safety Ms.Ose will choose the lab groups today Goggles, aprons and closed toe shoes must be worn to participate in the laboratory All materials can be disposed of down the sink

Lab Directions Part 1 Part 2 Be sure to only used distilled water Prepare a 0.30 M sucrose solution in the larger volumetric flask at your lab station Perform the calculations for your stock solution and dilution before beginning the lab. Ms. Ose must sign off on the calculation before you begin using chemicals Part 2 Dilute your stock solution to the molarity on the index card provided by Ms. Ose in the smaller volumetric flask Be sure to only used distilled water Follow the directions on the worksheet as modeled by Ms. Ose’s demo

Molarity/Dilutions Practice When you complete the lab activity, turn it in to Ms. Ose and begin working on the Molarity/Molality practice. Whatever is not completed in class will become your homework.

Exit Ticket Which molarity would be able to transmit the most light? What molarity would be able to transmit the least light? Explain.