1. Wed 4-20 and Thurs 4-21 Molarity and Dilution Mrs. Wilson

2. Objectives Calculate the concentration of a solution in units of molarity. Calculate the # moles or mass of solute dissolved in a solution. Use molarity to calculate the dilutions of solutions. ** Staple your group’s Colors of Chemistry labs together and turn it in as a packet. Homework: Lesson 6.6 homework; Daily Quiz next class.

3. Daily Quiz You can use a calculator and periodic table, although the math for this quiz is very easy.

4. What is Molarity?

6. Molarity (M, or molar) and Dilution

7. Kahoot! Figure out how to do molarity and dilution calculations. Win some Nerds! (do not change order of questions)

8. Calculate the concentration of a solution in units of molarity:

9. Calculate # moles, mass of solute, or volume:

10. Dilution

13. Let’s go over the test…

14. Preparing a Solution

15. Pg. 17 Review: Describe each step of the preparation of a standard solution of 500. mL of 0.150 M KMnO4, and include the necessary calculations in detail. (A “standard solution” is a solution that you precisely know the concentration of.)

16. Diluting a Solution

17. Pg. 17 Review: What volume of 12 M hydrochloric acid must be used to prepare 600 mL of a 0.30 M HCl solution? Describe the steps and equipment necessary to make this solution.

18. Quick Lab: Preparing and Diluting a Solution You have a 100 mL volumetric flask, stopper, graduated cylinder, beakers, wash bottle (for water), stirring rod, pipette, sugar (molar mass = 342 g/mol), volumetric pipette and bulb, and access to a weighing boat and a balance. Read the directions and diagram on pgs. 16-17. Make 100. mL of a 0.100 M sugar solution. Get Mrs. Wilson to check your individual work on the lab sheet provided. Pour your 0.100 M sugar solution into a beaker. Ask Mrs. Wilson to show you how to use the volumetric pipette and bulb. Wash out your volumetric flask. Read “Diluting a Solution” on pg. 17 and use your 0.100 M sugar solution to make 100. mL of a 0.0100 M sugar solution. Get Mrs. Wilson to check your individual work on the lab sheet provided.

19. Switch papers… Switch papers with someone in a different group, read each other’s summaries and give it a rating of 1 to 4: 4 (Exemplary): Complete sentences, very detailed, mentions all equipment and correct use; logical order of sentences. Concise and complete. 3 (Proficient): Complete sentences, detailed (some holes); mentions all equipment and correct use; logical order of sentences. Complete. 2 (Approaching): Some details (many holes), some equipment missing, some details are wrong or out of order – or too short/too brief to be considered complete. 1 (Beginning): Very hard to understand; many holes in logic. Most equipment is missing. Many details are wrong or out of order – or too short/too brief to be considered complete or accurate.