CHEMISTRY 161 Fall 2018 Dr. Mioy Huynh Concentration

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/chem161 CHEMISTRY 161 Fall 2018 Dr. Mioy Huynh

What is concentration? QUANTITY (AMOUNT) PER VOLUME (Its like a density!) Imagine Now pour you have someKoolinto Aid each in aflask. flask. Q1: Which flask is the most concentrated? A1: The concentrations are the same! Q2: How can we change the concentration?

A2: Add more powder mix or add/remove water. CHEMISTRY 161 Fall 2018 Dr. Mioy Huynh MOLARITY (M): Concentration of solution moles of solute mol Concentration= ; M= L Volume ( L ) of solution Think about what concentration means before getting into the math. 12 moles

4L Pour half M= 12 mol =3 M 4L 3 moles 1L 6 moles 2L Pour half

M= 6 mol =3 M 2L 3 moles 4L Add water M= 3 mol =3 M 1L

Each black dot represents a mole (the quantity/amount) M= 3 mol =0.75 M 4L CHEMISTRY 161 Fall 2018 Dr. Mioy Huynh You have 1.00 mol of sugar (C6H12O6) in 125.0 mL of solution. Calculate the concentration (in units of molarity). CHEMISTRY 161 Fall 2018

Dr. Mioy Huynh You have 1.00 mol of sugar (C6H12O6) in 125.0 mL 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 (C6H12O6) in 125.0 mL 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 (C6H12O6) in 125.0 mL of solution. Calculate the concentration (in units of molarity). Set up the general formula for molarity (concentration): 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 mL 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 mL 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 mL of this solution. 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? 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? 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? Set up the general formula for molarity (concentration): 10 moles 1L Partition into 200 mL M= 10 mol =10 M 1L

Take out 200 mL M= 2 mol =10 M 0.200 L CHEMISTRY 161 Fall 2018 Dr. Mioy Huynh You add 250.0 mL of water to 250.0 mL 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 mL of water to 250.0 mL of a 4.00 M sugar solution. Calculate the new concentration (in units of molarity). First, determine how many moles of sugar are in 250.0 mL of the 4.00 M solution. CHEMISTRY 161 Fall 2018 Dr. Mioy Huynh You add 250.0 mL of water to 250.0 mL of a 4.00 M sugar solution. Calculate the new concentration (in units of molarity).

First, determine how many moles of sugar are in 250.0 mL of the 4.00 M solution. Now, determine the new concentration if double the volume of the solution: CHEMISTRY 161 Fall 2018 Dr. Mioy Huynh You add 250.0 mL of water to 250.0 mL of a 4.00 M sugar solution. Calculate the new concentration (in units of molarity). First, determine how many moles of sugar are in 250.0 mL of the 4.00 M solution.

Now, determine the new concentration if double the volume of the solution: 1 mole 250 mL M= 1.00 mol = 4.00 M 0.2500 L CHEMISTRY 161 Fall 2018 Dr. Mioy Huynh

You add 250.0 mL of water to 250.0 mL of a 4.00 M sugar solution. Calculate the new concentration (in units of molarity). First, determine how many moles of sugar are in 250.0 mL of the 4.00 M solution. Now, determine the new concentration if double the volume of the solution: 1 mole 250 mL M= 1.00 mol

= 4.00 M 0.2500 L Add 250 mL of water 1 mole 500 mL M= 1.00 mol = 2.00 M 0.5000 L

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