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Solutions and Solubility
Lecture 4
27
Medical
Graduate
09/01/2015

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Term
Solution
Definition
A homogeneous mixture that consists of one or more solutes uniformly dispersed at the molecular or ionic level throughout a medium known as the solvent
Term
Solute
Definition

Material being dissolved 

 

(minority component by weight or concentration)

Term
Solvent
Definition

Material doing the dissolving

 

(Majority component by weight or concentration)

 

Term
Molar Concentration
Definition
Moles per liter of solution
Term
Molal Concentration
Definition
Moles per kilogram of solvent
Term
Percent by weight to Volume
Definition
Grams of solute per 100 mL of solution
Term
Percent by weight to weight
Definition
Grams of solute per 100 grams of solution
Term
Normality
Definition
Equivalent per liter
Term
Parts per million (ppm)
Definition
Amount of solute in 1 million parts of solution
Term
Miscible
Definition
Liquids that are soluble in each other in all proportions
Term
Immiscible
Definition
Liquids that are poorly soluble in each other
Term
Colloids
Definition

Not true solutions

 

Colloids consist of one phase uniformly dispersed in a second phase, but not actually dissolved 

Term
Heat of solution or Enthalpy of solution
Definition

The energy change associated when a solute dissolves in a solution 

 

Dissolving exactly one mole of solute in a solvent 

Term
Saturated Solution
Definition
Contain the maximun amount of a solute
Term
Endothermic Solutions
Definition
Occurs when the energy required to separate the ions exceeds the energy released by the combining of the ions with the water molecule
Term
Exothermic Solutions
Definition
Energy required to seperate the ions is less than the energy released by the combing of the ions with the water molecule
Term
Henry's Law
Definition

S=KH x Pgas

 

S=solubility

KH= Henry's constant

Pgas= partial pressure 

Term
Gaseous Solutes in liquid solvents
Definition
Expereince a decrease in solubility when temperature is increased
Term
Solid and liquid solutes in Liquid solvents
Definition
Experience an increase in solubility when temperature is increased
Term
Pressures effect on Solubility
Definition
An increase in pressure causes an increase in the solubility of a gaseous solute
Term
Colligative Properties
Definition

Vapor Pressure

Boiling Point

Freezing Point

Osmotic Pressure 

Term
Vapor Pressure
Definition

Most energetic molecules near the surface of a liquid escaping into the gas phase 

 

Adding an additional solute to the solution, replaces escape points of the orginal solute, therefore reducing vapor pressure 

Term
Raoult's Law
Definition
Can be used to quantify the change in vapor pressure from introduction of a solute
Term
Boiling Point
Definition
Temperature at which the vapor pressure of the material is equal to the ambient pressure
Term
Freezing Point
Definition

Temperature at which the liquid phase of the material is in equilibrium with the solid phase 

 

Adding a solute to a solution lowers freezing point by interfering in the organization of crystalline structures 

Term
Osmotic Pressure
Definition
Directly related to the number of solutes particles in solution
Term
Solubility Product
Definition
Ksp= (M+)X(A-)Y
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