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Introduction to Molarity

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Presentation on theme: "Introduction to Molarity"— Presentation transcript:

1 Introduction to Molarity
Chemistry Introduction to Molarity

2 Prescription drugs in the correct concentration make you better.
In higher concentration they can kill you.

3 Chemists need to make solutions that have precise concentrations

4 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.

5 Solution – a homogeneous mixture of two or more substances consisting of a solute and solvent (water). Solute – a substance dissolved in another substance (solvent). Solvent – a substance that dissolves a solute

6 Molarity = Moles (of solute)
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 = Moles (of solute) Liter (of solution) moles of NaCl is dissolved in 4.0 L of water, calculate the molarity. Molarity =

7 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 = Moles Liter moles of NaCl is dissolved in 4.0 L of water, calculate the molarity. Molarity = moles 4.0 L

8 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 = Moles Liter moles of NaCl is dissolved in 4.0 L of water, calculate the molarity. Molarity = moles 4.0 L = 0.56 moles/liter = 0.56 M (Molar) where M means moles per 1 liter

9 2. 5. 00 g KOH is dissolved in 250. mL of water, calculate the
g KOH is dissolved in 250. mL of water, calculate the molarity. Molarity =

10 2. 5. 00 g KOH is dissolved in 250. mL of water, calculate the
g KOH is dissolved in 250. mL of water, calculate the molarity. Molarity = 5.00 g

11 2. 5. 00 g KOH is dissolved in 250. mL of water, calculate the
g KOH is dissolved in 250. mL of water, calculate the molarity. Molarity = 5.00 g x 1 mole 56.11 g

12 2. 5. 00 g KOH is dissolved in 250. mL of water, calculate the
g KOH is dissolved in 250. mL of water, calculate the molarity. Molarity = 5.00 g x 1 mole 56.11 g 0.250 L

13 2. 5. 00 g KOH is dissolved in 250. mL of water, calculate the
g KOH is dissolved in 250. mL of water, calculate the molarity. Molarity = 5.00 g x 1 mole 56.11 g 0.250 L = M

14 3. How many moles are there in 205. mL of a 0.172 M solution?

15 3. How many moles are there in 205. mL of a 0.172 M solution?

16 3. How many moles are there in 205. mL of a 0.172 M solution?
0.205 L x moles 1 L

17 3. How many moles are there in 205. mL of a 0.172 M solution?
0.205 L x moles = moles 1 L

18 4. How many grams NaCl are there in 250.0 mL of 0.500 M solution?

19 4. How many grams NaCl are there in 250.0 mL of 0.500 M solution?

20 4. How many grams NaCl are there in 250.0 mL of 0.500 M solution?
0.250 L x moles 1 L

21 4. How many grams NaCl are there in 250.0 mL of 0.500 M solution?
0.250 L x moles x g 1 L mole

22 4. How many grams NaCl are there in 250.0 mL of 0.500 M solution?
0.250 L x moles x g = 7.31 g 1 L mole

23 5. How many grams of NaCl must be used to prepare a 100. 0 mL. of 0
5. How many grams of NaCl must be used to prepare a mL of M solution.

24 5. How many grams of NaCl must be used to prepare a 100. 0 mL. of 0
5. How many grams of NaCl must be used to prepare a mL of M solution. L

25 5. How many grams of NaCl must be used to prepare a 100. 0 mL. of 0
5. How many grams of NaCl must be used to prepare a mL of M solution. L x moles 1 L

26 5. How many grams of NaCl must be used to prepare a 100. 0 mL. of 0
5. How many grams of NaCl must be used to prepare a mL of M solution. L x moles x g 1 L mole

27 5. How many grams of NaCl must be used to prepare a 100. 0 mL. of 0
5. How many grams of NaCl must be used to prepare a mL of M solution. L x moles x g = g 1 L mole

28 6. How many milliliters of a 0. 200 M solution of CoCl2 will
6. How many milliliters of a M solution of CoCl2 will contain 25.0 g?

29 6. How many milliliters of a 0. 200 M solution of CoCl2 will
6. How many milliliters of a M solution of CoCl2 will contain 25.0 g? 25.0 g

30 6. How many milliliters of a 0. 200 M solution of CoCl2 will
6. How many milliliters of a M solution of CoCl2 will contain 25.0 g? 25.0 g x mole 129.9 g

31 6. How many milliliters of a 0. 200 M solution of CoCl2 will
6. How many milliliters of a M solution of CoCl2 will contain 25.0 g? 25.0 g x mole x 1 L 129.9 g mol

32 6. How many milliliters of a 0. 200 M solution of CoCl2 will
6. How many milliliters of a M solution of CoCl2 will contain 25.0 g? 25.0 g x mole x 1 L x 1000 mL 129.9 g mol L

33 6. How many milliliters of a 0. 200 M solution of CoCl2 will
6. How many milliliters of a M solution of CoCl2 will contain 25.0 g? 25.0 g x mole x 1 L x 1000 mL = mL 129.9 g mol L

34 7. Describe how you would prepare 100. 0 mL of a 0. 200 M
7. Describe how you would prepare mL of a M solution of CoCl2. L x moles x g = g 1 L mole Weigh 2.60 g of CoCl2 Dissolve in water Transfer to a 100 mL volumetric flask and fill to the line


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