Solutions The story continues. Heterogeneous mixture  Particles of varied size.

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Presentation transcript:

Solutions The story continues

Heterogeneous mixture  Particles of varied size

Heterogeneous mixtures  Suspension – Particles settle out if left alone  Colloids – Based on size of particles and the action of solution (477 table 1)

Homogeneous mixtures  You cannot see various parts of the solution. (479 table 2)

Concentration  Compares the amount of solute that is in a solvent  Many ways to express this…

Concentration  Percent by mass  % by mass = (mass solute/mass solvent)*100

Concentration  Percent by volume  % by volume = (volume solute/volume solution)*100

Concentration  Molarity  Molarity = (moles solute/liters solvent)

Concentration  Molarity

Concentration  Molality  Molality = (Moles solute/ Kg solution)

Solvation  Surrounding solute with solvent

Solvation  Soluble  Insoluble  Miscible  Immiscible

Types of Solutions  Unsaturated  Saturated  Supersaturated

Factors  Agitation  Surface area  Temperature  Solubility

Saturated Solutions  Temperature effect  Sugar in Water

Solubility  Page 493  Figure 15

Solubility of a gas  Depends on:  Temperature  Pressure  Higher pressure “Pushes” molecules into the solution

Solubility of a gas

Solubility  10 g of a gas dissolves in 2 L of water. What is the solubility of this gas in water?  3 moles of H 2 dissolves in 10 L of water. What is the solubility of H 2 ?

Solubility of a gas

 The solubility of a gas is.35 g/l at S.T.P. What is the solubility of the material if the pressure is reduced to.75 atm?

Solubility of a gas  At 25°C and 1 atm, 1 g of a gas dissolves in 2 L of water. What mass of the same gas will dissolve in 2 L of water at 25°C and 4 atm?

 Find the molarity of the solution formed by dissolving g Na Cl in.5 L solution.