Chp. 13.4- Concentration Terms Flashcards Preview

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Flashcards in Chp. 13.4- Concentration Terms Deck (15)
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1

Molarity (M)

amt. (mol) of solute / volume (L) of solution

2

Molality (m)

amt. (mol) of solute / mass (kg) of solvent

3

Parts of mass

mass of solute / mass of solution

4

Parts by volume

volume of solute / volume of solution

5

Mole fraction (X)

amt. (mol) of solute / [amt. (mol) of solute + amt. (mol) of solvent]

6

Sample Prob. 13.3. What is the molality of a solution prepared by dissolving 32.0 g of CaCl2 in 271 g of H20?

1.06 m CaCl2

7

Mass % = mass of solute / mass of solution * 100

mass of solute / mass of solution * 100

8

Volume %

volume of solute / volume of solution * 100

9

Mole fraction (X) =

amt. (mol)of solute / [amt. (mol) of solute + amt. (mol) of solvent]

10

Find the conc. of calcium ion (in ppm) in a 3.50-g pill that contains 40.5 mg of Ca2+.

1.16x10^4 ppm Ca2+

11

The label on a 0.750-L bottle of Italian chianti indicates "11.5% alcohol by volume". How many liters of alcohol does the bottle of wine contain?

0.0862 L

12

A sample of rubbing alcohol contains 142 g of isopropyl alcohol (C3H7OH) and 58 g of H20. What are the mole fractions of alcohol and water?

X_C3H7OH = 0.423

X_H20 = 0.577

13

If you were to make a 0.800m aqueous solution of glucose, what would be its boiling point and freezing point? (K_b = 0.51C/molarity, K_f=1.86C/molarity)

T_b = 100.41C

T_f = -1.49C

14

The higher the molality, the _______ the freezing point.

Lower.

(Adding solute to a solvent will essentially dilute the solvent molecules, and according to Raoult's law, this leads to a decrease in vapor pressure.

15

The higher the molality, the _______ the boiling point.

Higher