Unit 10 Water

Unit 10 Water and Solutions

You will need a calculator, solubility rules chart and solubility curves graph.

Describe the unique role of water in solutions in terms of polarity.

• Water is polar (positive hydrogen atoms, negative oxygen atom).

• water is the universal solvent and dissolves other polar molecules.

Multiple Choice

Which of these molecules represents water with the correct charges?

Multiple Choice

Water is polar and considered a universal solvent, which of these is NOT soluble in water?

• Sugar

• Salt

• Bacon Grease

• Lemon Juice

Solubility Rules

You should be able to determine if a substance is soluble or insoluble in water.

You should also be able to identify a precipitation reaction.

Multiple Choice

Is CaBr₂ soluble or insoluble?

• Soluble

• Insoluble

Multiple Choice

Is HgI₂ soluble or insoluble?

• Soluble

• Insoluble

Multiple Choice

Is Ca(OH)₂ soluble or insoluble?

• Soluble

• Insoluble

Molarity Calculations

Used to calculate the concentration of a solution.

Fill in the Blank

What is the molarity of a solution with 5 moles of solute in 2 liters of solution?

Fill in the Blank

If I have 300 mL of a 0.5 M NaBr solution, what will the concentration be if I added water to the 600 mL mark?

Multiple Choice

M1 = 5M

V1 = 10L

M2 = 10M

V2= ?

• 5L

• 10L

• 15L

• 20L

Distinguish among unsaturated, saturated and supersaturated solutions.

Multiple Choice

Which type of solution has less than the maximum amount of solute dissolved in it?

• Unsaturated

• Saturated

• Supersaturated

Multiple Choice

How much KClO3 would dissolve at 30^oC in 100 ml of water?

• 10

• 20

• 65

• 100

Multiple Choice

What type of solution is made by heating it up, dissolving more solvent, and then cooling it back down?

• Unsaturated Solution

• Saturated Solution

• Supersaturated Solution

Factors affecting the solubility of a solid in water...

• Increase temperature

• Increase surface area of solute

• Agitation

Factors affecting the solubility of a gas in water...

• Decrease Temperature

• Increase Pressure

• 
  

Multiple Choice

Which of these will dissolve faster in water when heated up?

• Carbon Dioxide

• Oxygen

• Sugar

Multiple Choice

Which of the following is NOT a way to increase the solubility of a solid?

• Heating it up

• Put it in the fridge

• Crush the solid into small pieces

• Stir the mixture