Objective: Today I will be able to: Calculate the molarity, molality, mole fraction and dilution for a solution Analyze the effect of changing the temperature on the solubility of a compound Evaluation/Assessment: Informal Assessment monitoring student interactions and questions as they complete the worksheets Formal Assessment analyzing student responses to the worksheet and exit ticket Common Core Connection Make sense of problem and persevere in solving them Look for and make use of structure Use appropriate tools strategically Evaluate: Warm-Up (5 minutes) Elaborate: Solutions Calculations Review 25 minutes Explain: Solubility Curves (5 minutes) Elaborate: Solubility Curve practice 15 minutes Evaluate: Exit Ticket Describe how to prepare 150 ml of a 1.2 M HCl solution from a 4.0 M HCl stock solution. Today I will be able to: Calculate the molarity, molality, mole fraction and dilution for a solution Analyze the effect of changing the temperature on the solubility of a compound Study for the Molarity, Molality, Mole Fraction and Dilution Quiz Tomorrow Warm Up Concentration Practice Solubility Curve Notes Solubility Curve Practice Exit Ticket Molarity (M) moles of solute/liters of solution Use Molarity calculations Use a 1 L volumetric flask - calculate the formula weight of the compound - Dilute compound with water to the 1 L mark on the flask - Invert solution to mix - Creates a 1 M concentration solution Dilution of a more concentrated solution to a less concentrated one V old x M old = V new x M new Molality = moles of solute/kg of solvent Practice: What is the molality of a solution in which 3.0 moles of NaCl is dissolved in 1.5 kg of water? i = moles of i total moles mole of NaCl is dissolved into grams of pure H 2 O. What is the mole fraction of NaCl? Steps to solve the problem Convert mass of H 2 O moles of H 2 0 Add the moles of H 2 O and NaCl together to get the total number of moles in the solution Divide the moles of NaCl by the total number of moles Answer: No units because it is a ratio! Lets review some of the answers from the worksheets you all completed on Friday. Think about: How does temperature affect solubility What effect does increasing the temperature have on the solubility of a liquid? In general it increases Why? Molecules move around more rapidly to dissolve quicker Gas solubility decreases with temperature increase Why does this happen? Molecules move faster, the gas particles escape the solution Complete the questions relating to the solubility curve. Ask Mr. Klotz for help if you have questions What is the molality of a saturated KCl solution At 80 o C?