Chapter 8 - Solutions - Concentration and molarity

Question 1

What does concentration mean?

Answer 1

The concentration of a solution is the amount of solute present in a specified amount of solvent or solution.

Question 2

What are the different ways of expressing concentration?

Answer 2

• Mass of solute/100ml or 1L of solvent or solution
• Volume of solute/100ml or 1L of solvent or solution
• %(w/v) - mass of solute/100mL of solution
• %(v/v) - volume of solute/100ml of solution
• %(w/w) - mass of solute/100g solution
• ppm (parts per million) g of solid or liquid solute/million g of solute

Question 3

What is a dilute solution?

Answer 3

A solution which contains a relatively low concentration of the solute.

Question 4

What is a concentrated solution?

Answer 4

A solution which contains a relatively high concentration of solute.

Question 5

What is molarity?

Answer 5

Molarity of a solution is the number of moles of solute per litre of solution.

Question 6

How do we calculate molarity?

Answer 6

c=n/V

Question 7

What is a standard solution?

Answer 7

Solutions in which the concentration is accurately known.

Question 8

What is the formula used for calculating the volume to which a given solution must be diluted to give a required concentration or the concentration that results from a particular dilution?

Answer 8

C1V1=C2V2