Unit 2 Chemistry Concentration

Concentration is

• the amount of solute in the solvent

• the amount of solvent in the solute

• density

• particle size

Which solution is more concentrated?

Solution 1:

500 mL of water

100 g of salt

Solution 2:

500 mL of water

90 g of salt

• Solution 1

• Solution 2

• They have the same concentration

• I have no idea

Which solution is more concentrated?

Solution 1:

20 mL of water

5 g of salt

Solution 2:

20 mL of water

10 g of salt

• Not enough information to tell

• Solution 1

• Solution 2

• They are equally concentrated

A solution is made up of

• solute
• solvent
• solute in a solvent
• solute in a solution

Concentration of a solution is expressed in

• moles
• molar
• molar mass
• molarity

To prepare 2.5M of NaOH, you will need a mass of ______g NaOH

• 10g
• 100g
• 40g
• 80g

To prepare 1M of NaOH, you will need a mass of ______g NaOH

• 23g
• 40g
• 4g
• 39g

If I added 120g of NaOH into 1 dm³ of solution the molarity will be

• 2M
• 3M
• 120M
• 40M

What is the mass of Na₂CO₃ required to make a 500 mL standard solution of 0.400 mol/L Na₂CO₃?

• 21.2 g

• 23.4 g

• 25.8 g

• 27.3 g

A solution that can hold more solute  is called

• saturated
• supersaturated
• unsaturated
• insoluble