Ch 12 Section 3

Question 1

the concentration of a solution is a measure of the amount of solute in a

Answer 1

given amount of solvent or solution

Question 2

two different ways of expressing the concentrations of solutions:

Answer 2

molarity and molality

Question 3

sometimes, solutions are referred to as… or … but these aren’t definite terms

Answer 3

dilute; concentrated

Question 4

dilute means that there is a relatively small amount of

Answer 4

solute in a solvent

Question 5

concentrated means that there is a relatively large amount of

Answer 5

solute in a solvent

Question 6

the terms dilute and concentrated are unrelated to the degree to which a solution is

Answer 6

saturated

Question 7

a saturated solution of a substance that is not very soluble might be very

Answer 7

dilute

Question 8

molarity is the number of moles of solute in

Answer 8

one liter of solution

Question 9

to relate the molarity of a solution to the mass of solute present, you must know the

Answer 9

molar mass of the solute

Question 10

the relationship between molarity, moles, and volume is expressed as:

Answer 10

molarity (M)= amount of solute (mol)/ volume of solution (L)

Question 11

the molarity of any solution can be calculated by dividing the number of moles of solute by the

Answer 11

number of liters of solution

Question 12

a 1 M solution is not made by adding 1 mol of solute to

Answer 12

1 L of solvent

Question 13

Instead, 1 mol of solute is first dissolved in less than

Answer 13

1 L of solvent

Question 14

then, the resulting solution is carefully diluted with more solvent to bring the

Answer 14

total volume to 1 L

Question 15

Molality is the concentration of a solution expressed in moles of solute per

Answer 15

kilogram of solvent

Question 16

a solution that contains 1 mol of solute dissolved in exactly 1 kg of solvent is a

Answer 16

“one molal” solution

Question 17

the symbol for molality is an italicized

Answer 17

m

Question 18

molality=

Answer 18

moles solute/ mass of solvent (kg)

Question 19

the molality of any solution can be found by dividing the number of moles of solute by the

Answer 19

mass in kg of the solvent in which it is dissolved

Question 20

note that if the amount of solvent is expressed in grams, the mass of solvent must be converted to kilograms by multiplying by this conversion factor:

Answer 20

1 kg/ 1000 g

Question 21

concentrations are expressed as molalities when studying properties of solutions related to

Answer 21

vapor pressure and temperature changes

Question 22

molality is used because it does not change with changes in

Answer 22

temperature