Chapter 13: Molality

Question 1

Molality

Answer 1

In chemistry, the molality, b, of a solution is defined as the amount of substance of solute, divided by the mass of the solvent.

mole of solute / kg of solvent

Question 2

Solute

Answer 2

The substance in a dilution that is the one being diluted

Question 3

Solvent

Answer 3

The substance being used to dilute the solute.

Question 4

Molality

Answer 4

Lower case “m.”

X moles of solute / kg solvent

Question 5

Calculating ppm

Answer 5

1 g X / 1x10^6 g solution =
1 x 10^-6 g X / 1 g solution =
1 microgram X / 1 g solution

Question 6

Calculating ppm for water

Answer 6

( 1 g / 1 mL) * 1 ppm X =

(1 microgram X / 1 mL solution) * Molarity of X

Question 7

Calculating ppm

Answer 7

X micro gram / 1 mL solution =
1,000 micrograms * X / 1 L solution =
X mg / 1 L solution

Question 8

Mole fraction

Answer 8

Moles of A (solute) / total moles of solution

Question 9

Defining ppm/ppb

Answer 9

(Mass of A in solution / total mass of solution) * 10^6/9

Question 10

Molarity

Answer 10

moles of solute / L of solution