Chemistry; Unit 9 Introduction to Molarity Lesson 1.
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Transcript of Chemistry; Unit 9 Introduction to Molarity Lesson 1.
![Page 1: Chemistry; Unit 9 Introduction to Molarity Lesson 1.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bff11a28abf838cbb709/html5/thumbnails/1.jpg)
Chemistry; Unit 9
Introduction to Molarity
Lesson 1
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Prescription drugs in the correct concentration make you better.In higher concentration they can kill you.
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Chemists need to make solutions that have precise concentrations
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Pesticides must be in proper concentrations.
Food additives must be in correct concentrations.
A driver is legally impaired at 0.08 mg/mL blood alcohol content.
Chemists control the concentration of chemicals using the concepts we will develop in this unit.
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The concentration of a solution tells you how much solute that is dissolved in a given amount of solvent (water).
The molarity is the concentration of a solution.
Molarity = MolesLiter
1. 2.255 moles of NaCl is dissolved in 4.0 L of water, calculate the molarity.
Molarity =
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The concentration of a solution tells you how much solute that is dissolved in a given amount of solute (water).
The molarity is the concentration of a solution.
Molarity = MolesLiter
1. 2.255 moles of NaCl is dissolved in 4.0 L of water, calculate the molarity.
Molarity = 2.255 moles4.0 L
![Page 7: Chemistry; Unit 9 Introduction to Molarity Lesson 1.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bff11a28abf838cbb709/html5/thumbnails/7.jpg)
The concentration of a solution tells you how much solute that is dissolved in a given amount of solute (water).
The molarity is the concentration of a solution.
Molarity = MolesLiter
1. 2.255 moles of NaCl is dissolved in 4.0 L of water, calculate the molarity.Molarity = 2.255 moles
4.0 L
= 0.56 moles/liter
= 0.56 M (Molar)where M means moles per 1 liter
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2. 5.00 g KOH is dissolved in 250. mL of water, calculate the molarity.
Molarity =
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2. 5.00 g KOH is dissolved in 250. mL of water, calculate the molarity.
Molarity = 5.00 g
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2. 5.00 g KOH is dissolved in 250. mL of water, calculate the molarity.
Molarity = 5.00 g x 1 mole56.11 g
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2. 5.00 g KOH is dissolved in 250. mL of water, calculate the molarity.
Molarity = 5.00 g x 1 mole56.11 g
0.250 L
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2. 5.00 g KOH is dissolved in 250. mL of water, calculate the molarity.
Molarity = 5.00 g x 1 mole56.11 g
---------------------------0.250 L
= 0.356 M
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3. How many moles are there in 205. mL of a 0.172 M solution?
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3. How many moles are there in 205. mL of a 0.172 M solution?
0.205 L
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3. How many moles are there in 205. mL of a 0.172 M solution?
0.205 L x 0.172 moles1 L
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3. How many moles are there in 205. mL of a 0.172 M solution?
0.205 L x 0.172 moles = 0.0353 moles1 L
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4. How many grams NaCl are there in 250.0 mL of 0.500 M solution?
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4. How many grams NaCl are there in 250.0 mL of 0.500 M solution?
0.250 L
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4. How many grams NaCl are there in 250.0 mL of 0.500 M solution?
0.250 L x 0.500 moles
1 L
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4. How many grams NaCl are there in 250.0 mL of 0.500 M solution?
0.250 L x 0.500 moles x 58.5 g
1 L 1 mole
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4. How many grams NaCl are there in 250.0 mL of 0.500 M solution?
0.250 L x 0.500 moles x 58.5 g = 7.31 g
1 L 1 mole
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5. How many grams of NaCl must be used to prepare a 100.0 mL of 0.250 M solution.
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5. How many grams of NaCl must be used to prepare a 100.0 mL of 0.250 M solution.
0.1000 L
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5. How many grams of NaCl must be used to prepare a 100.0 mL of 0.250 M solution.
0.1000 L x 0.250 moles 1 L
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5. How many grams of NaCl must be used to prepare a 100.0 mL of 0.250 M solution.
0.1000 L x 0.250 moles x 58.5 g 1 L 1 mole
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5. How many grams of NaCl must be used to prepare a 100.0 mL of 0.250 M solution.
0.1000 L x 0.250 moles x 58.5 g = 1.46 g1 L 1 mole
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6. How many milliliters of a 0.200 M solution of CoCl2 will contain 25.0 g?
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6. How many milliliters of a 0.200 M solution of CoCl2 will contain 25.0 g?
25.0 g
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6. How many milliliters of a 0.200 M solution of CoCl2 will contain 25.0 g?
25.0 g x 1 mole 129.9 g
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6. How many milliliters of a 0.200 M solution of CoCl2 will contain 25.0 g?
25.0 g x 1 mole x 1 L 129.9 g 0.200 mol
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6. How many milliliters of a 0.200 M solution of CoCl2 will contain 25.0 g?
25.0 g x 1 mole x 1 L x 1000 mL 129.9 g 0.200 mol 1 L
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6. How many milliliters of a 0.200 M solution of CoCl2 will contain 25.0 g?
25.0 g x 1 mole x 1 L x 1000 mL = 962 mL 129.9 g 0.200 mol 1 L
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7. Describe how you would prepare 100.0 mL of a 0.200 M solution of CoCl2.
0.1000 L x 0.200 moles x 129.9 g = 2.60 g1 L 1 mole
Weigh 2.60 g of CoCl2
Dissolve in water
Transfer to a 100 mL volumetric flask and fill to the line