Catalyst 1.How many particles are in 2 moles of KBr? 2.You dissolve 35 g of CH 3 COOH in 2 L of water. What is the molarity of this solution? End.

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Catalyst 1.How many particles are in 2 moles of KBr? 2.You dissolve 35 g of CH 3 COOH in 2 L of water. What is the molarity of this solution? End

Learning Targets Based on the exit ticket and your current level of understanding, rate yourself 1 – 4 on LT If you haven’t learned the topic, put a zero

Homework Tracker Go to Mr. Astor’s Website and update your homework tracker If you have done the homework, put an x, if you haven’t, put an O.

Homework 3.1 – KCL: Dangers & Benefits Let’s talk about the reading What is the crux of the story? How do you feel about the death penalty? What does this tell us?

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Death Penalty Reading

Problem! I know that I need to make a 10 M solution that has a volume of 2 L in order to torture my gummy bear. How do I know how many grams to put in my flask?

Lecture 3.9 – Solution Calculations

How do we determine grams from molarity?

I. Hold Up! We Can Work in Reverse We can work backwards if we have a molarity and volume of solution. From this we can determine both the moles and mass of our solute Molarity of the solution Molar Mass of solute

Class Example If you have a 3 L of a 0.6 M solution of AgNO 3, then what mass of AgNO 3 is contained in this solution?

Table Talk If all the water in L of a 0.45 M NaCl solution evaporates, what mass of NaCl remains?

SUMMARIZE

Lab Conduct Follow the procedure that has been given to you Respect the equipment. It costs a lot of money to replace this stuff Use the chemicals in a responsible and safe way Clean up the space when you are done Read the steps, they will tell you what to do.

Read the procedure. Once completed begin assigning roles to group members

How to Document your Procedure 1) Record every step of your lab (it can be in 10 second intervals, or 2 minute intervals – it’s up to you) 2) Write down precisely every step you do so that you know exactly how your lab was performed. 3) Upload this to wikispace as your final component to Unit 3.

Mass By Difference

The Meniscus Measure at the bottom!

Volumetric Flasks

Closing Time There will be a lab report on this lab. More information to come. Make sure to save the lab report! Unit 3 Exam