Lesson 4.2 : Molarity and Molality

Question 1

-concentration of aqueous solutions are usually expressed in

-number of moles of the solute dissolved in one liter of the solution

Answer 1

Molarity (mol / L)

Question 2

-used for more delicate measurements that require very precise measurements of concentration

-does not contain any volume term

-defined as the number of moles of solute dissolved in one kilogram of the solvent

Answer 2

Molality (mol / kg)

Question 3

M, L solution - ___

m, kg solvent - ___

Answer 3

Molarity

Molality

Question 4

What is the formula for Molarity?

Answer 4

M = n solute ÷ v solution

or

M = mol solute ÷ (L) solution

Question 5

What is the formula for Molality?

Answer 5

m = n solute ÷ m solvent

or

m = mol solute ÷ kg solvent