**Housekeeping:**Well, here we go again with these random off days. *Kanye shrug* As a result, turn in a hard copy of your rough draft on Sunday, Nov. 15. I will get them back to you ASAP so you can finish your final draft. DO NOT EMAIL ME YOUR LAB REPORT.

Your exam is Nov. 25. I have posted the answer key to the practice test and am available to answer questions any time at the beginning of class until the day of the exam. We will have a comprehensive review before the exam, of course, but you need to have the practice test and the quizzes completed and with you those days in class. If you don't have the completed work and/or questions from the readings, then the review will not be nearly as detailed as you like.

**Agenda:**

1. Solution Chemistry with Mr. Thornley

**Lesson Objectives.**You should be able to...

1. Describe the components of a solution

2. Calculate concentration of a solution using the c= n/V equation and c1V1=c2V2 equation

3. Prepare a stock solution

**Content Review:**

Links: 1.3: Reacting Masses & Volumes

Textbook Readings: Section 1.3; p. 33-48

**Student Missions:**

Mission 1: The Problem is the Solution.Section 1.3: Solutions gives you an overview of solution chemistry. Terms to know: solute, solvent, concentration, dilute, stock solution, volumetric analysis and titration. You have to complete a titration practical, which we will worry about when we get back.

Mission 1: The Problem is the Solution.

Mr. Thornley is on the case.

Now let's add some numbers to this. Don't forget the equations c = n/V and c1V1 = c2V2.

Doc Brown's chemistry page has a nice summary regarding concentration. Remember, however, that the term "molarity" is falling out of use, and instead "c" for concentration should be used in its place. You should go through the practice problems which include the solutions (get it?).

Concentration Dilution Making Stock Solutions

The second video shows you how to dilute a solution from a stock solution. Recall the equation c1V1 = c2V2. "1" means initial conditions (the stock solution) and "2" means final conditions (the requirements for the diluted solution).

**Homework.**Girls, you really need to continue practicing and getting ready for the test. Here are some solution concentration practice problems. They include answers, but you need to show your work.Concentration Dilution Making Stock Solutions

**Mission 2: Solution Preparation.**I will show you the proper technique for preparing stock solutions from solid solutes. You need to be aware of the steps, and while I'll go through this procedure with you, you should have a reference to study outside of class. Recall the equation c = n/V. You have to determine how much of the stock solution you want to prepare (V) and the concentration that you require (c). "n" is the number of moles of the solute that you'll need.The second video shows you how to dilute a solution from a stock solution. Recall the equation c1V1 = c2V2. "1" means initial conditions (the stock solution) and "2" means final conditions (the requirements for the diluted solution).

Your homework for solution prep and dilution is above. We will go through these problems after the break.