1. Intro to Solutions Molarity Calculations

2. Evaluation/Assessment:
Objective:
Today I will be able to:
Explain the properties of solutions
Calculate the concentration of solutions using the equation for molarity.
Evaluation/Assessment:
Informal assessment – monitoring student progress as they complete the practice
Formal assessment – analyzing student responses to the classwork and exit ticket.
Common Core Connection
Build Strong Content Knowledge
Make sense of problem and persevere in solving them
Look for and express regularity in repeated reasoning

3. Lesson Sequence Evaluate: Warm – Up
Engage and Explore: Research Solutions Vocabulary, Design Poster
Explain: Solutions Vocabulary Presentations
Elaborate: Molarity Calculations
Evaluate: Exit Ticket

4. Warm - Up As you enter, choose your new seat for 4th quarter.
What is a solution?
What are some examples of a solution?
What are the two types of mixtures? Write one example of each type of mixture.
What type of mixture is a solution?

5. Objective Today I will be able to: Explain the properties of solutions
Calculate the concentration of solutions using the equation for molarity

6. Homework
Finish Molarity Calculations

7. Agenda Warm-Up Solutions Vocabulary Research Design Vocabulary Poster
Solutions Vocabulary Presentations
Molarity Calculations
Exit Ticket

8. Solutions Vocabulary Activity Directions

9. Solutions Vocabulary Activity Directions
OVERVIEW
Today you will teach the class vocabulary from the solutions unit
Each group will be assigned a section to take notes and research the vocabulary
Groups will design a poster
Groups will present the poster to the class
As the groups present, you will record the information presented as your notes

10. Solutions Vocabulary Research and Poster Designing
You have 15 minutes to research the vocabulary and design a poster. Write large and neatly so the poster can be read by your peers during your presentation

11. Presentations
Each group will have 3-4 minutes to share the information that they found. The class will record the information on the solutions notes sheet

12. Mr. Klotz’s Solutions notes for those students who are absent

13. Review: What is a solution?
Homogeneous mixture; ability of one substance to dissolve another substance

14. Components of Solutions
What is a solvent?
Solvent – the dissolving medium
- Water = aqueous solution
- Alcohol = tincture
What is a solute?
Solute – what is being dissolved
When a solute dissolves in a solvent, the molecules of solute enter the spaces between the molecules of the solvent

15. Components of Solutions
Like dissolves like – polar and most ionic substances dissolve in polar solvents
- Interactions occur between the solute and solvent molecules
- Nonpolar dissolves in nonpolar
- Nonpolar solutes are NOT attracted to nonpolar solvents
- They depend on random motion in the solution process

17. Factors effecting the rate of solubility
Size of solute
Stirring rate
Adding Heat

18. Concentrations of Solutions
An increase in temperature of a solution generally INCREASES the solubility of a SOLID in a LIQUID
An increase in temperature of a solution generally DECREASES the solubility of a GAS in a LIQUID

19. What is a nonelectrolyte
What is an electrolyte?
A solution that conducts electricity
What is a nonelectrolyte
A solution that does not conduct

20. Types of Solutions Solid in a solid – jewelry
Liquids in liquids (miscible) – antifreeze
Liquids in solids – dental filling
Gas in a gas – air
Gas in a liquid – soda
Solid in a liquid – sea water

21. Miscible – layers that dissolve freely in each other
Immiscible – layers that do not dissolve in each other

22. Concentrations of Solutions
Unsaturated – less than the maximum of amount of solute
Saturated – maximum amount of solute dissolved
Supersaturated – more than the maximum amount of solute dissolved due to heating and rapid cooling

23. Concentration of a Solution
Molarity (M) – moles of solute/liters of solution

24. Preparing Solutions

25. Preparing Solutions 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

26. Dilution of a more concentrated solution to a less concentrated one
Preparing Solutions
Dilution of a more concentrated solution to a less concentrated one
V old x M old = V new x M new

27. Things that Remind Mr. Klotz of Solutions (but are not)
Suspension - a mixture from which some particles will slowly settle when left alone for a period of time (muddy water)
- Particles that settle can be filtered out

28. Things that Remind Mr. Klotz of Solutions (but are not)
Colloid – heterogeneous mixture of two or more substances that appears to be a solution
Smoke (solid in gas), marshmallow (gas in a solid), whipped cream (gas in a liquid)

29. Things that Remind Mr. Klotz of Solutions (but are not)
Tyndal Effect – allows you to distinguish between a true solution and a colloid
Shine a light on a true solution, and the light is invisible
Shine a light on a colloid, and you will be able to see the light beam as it reflects off the relatively large solute particles (headlights in fog)

32. Molarity Calculations
Complete the calculations at your desk. Ask Mr. Klotz for help if you have questions. Questions not completed in class will become homework

33. Exit Ticket
How would you prepare 1.5 L a 2.0 M solution from a stock solution of 6.0M HCl?