Chapter 20 Concentration. Molarity (M) Moles of solute per liter of solution. Molarity = moles of...

Chapter 20

Concentration

Molarity (M)

• Moles of solute per liter of solution.

Molarity =moles of soluteliters of solution

What is the molarity of a solution prepared by What is the molarity of a solution prepared by dissolving 21.0 g of CaCldissolving 21.0 g of CaCl22 in 500.0 mL of solution? in 500.0 mL of solution?

0.378M CaCl2

What is the molarity of a solution prepared by What is the molarity of a solution prepared by dissolving 48.4 g of CaCldissolving 48.4 g of CaCl22 in 100.0 mL of solution? in 100.0 mL of solution?

4.36M CaCl2

molality (m)

• Moles of solute per kilogram of solvent.

molality =moles of solute

kg of solvent

What is the molality of a solution prepared by What is the molality of a solution prepared by dissolving 92.3 g of KF in 100.0g of water? dissolving 92.3 g of KF in 100.0g of water?

15.9m KF

What is the molality of a solution prepared by What is the molality of a solution prepared by dissolving 20.0g of NHdissolving 20.0g of NH44Cl in 400.0g of water? Cl in 400.0g of water?

0.935m NH4Cl

Mole Fraction (X)

• moles of component per total moles of solution.

mole fraction =moles of component

total moles in solution

Note: The mole fractions of the solute and solvent add up to “1”

What is the mole fraction of CWhat is the mole fraction of C44HH1010O in a solution O in a solution

containing 75.6g of Ccontaining 75.6g of C1010HH88 and 600.0g of C and 600.0g of C44HH1010O? O?

XC4H10O = 0.932

containing 67.4g of Ccontaining 67.4g of C99HH77N and 200.0g of CN and 200.0g of C22HH66O? O?

XC2H6O = 0.893

Percent Solution by mass

• Represents the number of grams of solute per 100 grams of solution.

% solution = mass of solutemass of solution

A solution contains 130g of HCl in 750g of water. A solution contains 130g of HCl in 750g of water. What is the percent by mass of this HCl solution?What is the percent by mass of this HCl solution?

14.8% HCl

What is the mass percent of a solution What is the mass percent of a solution containing 67.4g of Ccontaining 67.4g of C99HH77N in 200.0g of CN in 200.0g of C22HH66O? O?

25.2% C9H7N

Homework

• Worksheet: Concentration

Chapter 20 Concentration. Molarity (M) Moles of solute per liter of solution. Molarity = moles of...

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Molarity = Moles of solute/Liters of Solution (M) Molalityweb.chem.ucsb.edu/~devries/chem1C/handouts/ppt17.pdf · Molality = Moles of solute/Kg of Solvent (m) Concentration ... Apply