CHEMISTRY 161 Fall 2018 Dr Mioy Huynh Concentration

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh Concentration Qualitatively DR. MIOY T. HUYNH YALE UNIVERSITY CHEMISTRY 161 FALL 2018 www. mioy. org/chem 161

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh What is concentration? QUANTITY (AMOUNT) PER VOLUME (It’s like a density!) Imagine you Now pour have Koolsome into Aid in a flask. each flask. Q 1: Which flask is the most concentrated? A 1: The concentrations are the same! Q 2: How can we change the concentration? A 2: Add more powder mix … or add/remove water.

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh MOLARITY (M): Concentration of solution Think about what concentration means before getting into the math. 12 moles 4 L Pour half 3 moles 1 L 6 moles 2 L Pour half 3 moles 4 L Add water Each black dot represents a mole (the quantity/amount)

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You have 1. 00 mol of sugar (C 6 H 12 O 6) in 125. 0 m. L of solution. Calculate the concentration (in units of molarity).

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You have 1. 00 mol of sugar (C 6 H 12 O 6) in 125. 0 m. L of solution. Calculate the concentration (in units of molarity). Set up the general formula for molarity (concentration):

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You have 1. 00 mol of sugar (C 6 H 12 O 6) in 125. 0 m. L of solution. Calculate the concentration (in units of molarity). •

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You have 1. 00 mol of sugar (C 6 H 12 O 6) in 125. 0 m. L of solution. Calculate the concentration (in units of molarity). • Remember that this is just a ratio of moles per volume. It does not mean you have 8 moles of sugar or that you have 1 L of solution.

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You have a 2. 50 M sugar solution. Calculate the number of moles of sugar in 300. 0 m. L of this solution.

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You have a 2. 50 M sugar solution. Calculate the number of moles of sugar in 300. 0 m. L of this solution. Set up the general formula for molarity (concentration):

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You have a 2. 50 M sugar solution. Calculate the number of moles of sugar in 300. 0 m. L of this solution. •

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You have a 10. 0 M sugar solution. What volume of this solution do you need to have 2. 00 mol sugar?

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You have a 10. 0 M sugar solution. What volume of this solution do you need to have 2. 00 mol sugar? Set up the general formula for molarity (concentration):

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You have a 10. 0 M sugar solution. What volume of this solution do you need to have 2. 00 mol sugar? •

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You have a 10. 0 M sugar solution. What volume of this solution do you need to have 2. 00 mol sugar? • 10 moles 1 L Partition into 200 m. L Take out 200 m. L

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You add 250. 0 m. L of water to 250. 0 m. L of a 4. 00 M sugar solution. Calculate the new concentration (in units of molarity).

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You add 250. 0 m. L of water to 250. 0 m. L of a 4. 00 M sugar solution. Calculate the new concentration (in units of molarity). •

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You add 250. 0 m. L of water to 250. 0 m. L of a 4. 00 M sugar solution. Calculate the new concentration (in units of molarity). •

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You add 250. 0 m. L of water to 250. 0 m. L of a 4. 00 M sugar solution. Calculate the new concentration (in units of molarity). • 1 mole 250 m. L

CHEMISTRY 161 – Fall 2018 Dr. Mioy Huynh You add 250. 0 m. L of water to 250. 0 m. L of a 4. 00 M sugar solution. Calculate the new concentration (in units of molarity). • 1 mole 250 m. L Add 250 m. L of water 1 mole 500 m. L