Factors affecting SolubilityFactors affecting Solubility

Activity 1Activity 1Solutions are found at home and

in the environment.Solutions are made up of solutes

and solvents.Solutions can be solid, liquid or

gas.Solutions can be naturally

occurring or manufactured.

Activity 2Activity 2Solutions have only one phase,

thus, a uniform appearance.The components of a solution

cannot be separated through filtration because their particles are very small that they can pass through the holes of the filter paper.

Activity 3Activity 3A saturated solution is a solution that

contains the maximum amount of solute that the solvent can dissolve.

The presence of excess solute that can no longer dissolve is the evidence that a solution is saturated.

An unsaturated solution is a solution that contains less solute than the maximum amount that the solvent can dissolve.

Concentrations of Concentrations of solutionssolutionspercent by volume – amount of

solute in a given volume of solution (g/100 mL)

percent by mass – amount of solute in a given mass of solvent (g/100g)

What could affect the What could affect the solubility of solutes in solubility of solutes in solutions?solutions?

Add a teaspoon of salt

Add a teaspoon of salt

Stirred

Not stirred

Why would the solute Why would the solute dissolve faster when the dissolve faster when the solution is stirred?solution is stirred?

Why would the solute Why would the solute dissolve faster when the dissolve faster when the solution is stirred?solution is stirred?

Why would the solute Why would the solute dissolve faster when the dissolve faster when the solution is stirred?solution is stirred?

Why would the solute Why would the solute dissolve faster when the dissolve faster when the solution is stirred?solution is stirred?

Why would the solute Why would the solute dissolve faster when the dissolve faster when the solution is stirred?solution is stirred?

Why would the solute Why would the solute dissolve faster when the dissolve faster when the solution is stirred?solution is stirred?

Stirring causes the particles of solute

and solvent to move faster increasing

the chances of contact.

Activity 4Activity 4Which will dissolve faster –

crystals of table salt or the same amount of crushed table salt?

ProceduresProceduresAdd 50 mL of water

into 2 identical containers.

Add 5 grams of rock salt to one container and 5 grams iodized

salt to the other container.

Record the time it takes the salt to

dissolve in each of the containers.

Independent variable

Dependent variable

What makes the crushed salt What makes the crushed salt dissolve faster than the dissolve faster than the crystals of salt?crystals of salt?

crystal of table

salt

crushed table salt

Smaller particles have more edges and corners

where the solvent can be in contact. Thus, the smaller the particle of salt, the

easier it mixes with water.

The Coffee ProblemThe Coffee ProblemWhy do people stir coffee in

water after they have added sugar?

Parallel InvestigationsParallel InvestigationsActivity 5: How fast does coffee

dissolve in hot water? In cold water? [G1-G5]

Activity 6: Which dissolves faster in hot and cold water: sugar or salt? [G6-G10]

Prepare a lab sheet that will answer the problem assigned to your group.

Do not forget to formulate a hypothesis for your problem.

Bring the materials that you will need for the investigation next session.