4.4 Molar concentration

Question 1

What is molar concentration used for

Answer 1

determining the moles of solute in a litre of solution

Question 2

what are the various ways to express the concentration of a sugar solution:

Answer 2

1. number of grams of sugar per kilogram of water
2. number of grams of sugar per litre of water
3. number of grams of sugar per millilitre of solution.

Question 3

what is the most common way to express concentration in chemistry

Answer 3

Molar concentration aka molarity

Question 4

What is molarity defined as

Answer 4

Molarityis defined asmoles of solute per litre of solution.
Molarity(abbrev:M) =moles of solute/litres of solution
(Note:Notper litre ofwater! The difference is subtle but important)*

Question 5

What is the formula for molarity

Answer 5

Molar concentration = Moles/Volume or C = n

Question 6

What are the units of molarity

Answer 6

The official SI unit for concentration is kilomoles per cubic metre (kmol/m3), but 1 kmol = 1000 moles and 1 m3= 1000L so 1kmol/m3 = 1