Properties of Solutions

Question 1

Drugs as solutions, why?

Answer 1

In order to be dispersed in the body it usually has to be in a liquid form

Question 2

Define solution

Answer 2

homogenous mixture of two or more substances

Solvent and solute

Question 3

Concentration of a solution can be expressed as

Answer 3

Volume of solution or mass of solvent or solution

Question 4

Molarity

Answer 4

Number of moles of solute in 1 liter of solution

mol/L

Question 5

Molality

Answer 5

Number of moles of solute in 1000g of solvent

mol/kg

Question 6

Types of solutions are based on

Answer 6

Particle size
Reactivity (ideal or non-ideal)
Concentration (saturation)
Types (electrolyte or non-electrolyte)

Question 7

Types based on particle size

Answer 7

True solution, colloidal or coarse dispersions

Question 8

True solutions

Answer 8

Particles size less than 1 nm
Homogenous
Invisible to electron microscope and to naked eyes

Question 9

Colloidal Dispersion

Answer 9

Larger than individual ions ro molecules, but too small to settled out by gravity
Dispersed (internal phase) or continuous (dispersion medium) phases
May be solid, liquid or gas
Scatters light rays
Visible to electron microscope but can pass through filter paper
Milk

Question 10

Course Dispersion

Answer 10

Larger than .5 micrometers
Visible to naked eye
Lotions

Question 11

Suspensions

Answer 11

Mixed but no dissolved

Settle over time

Question 12

Ideal solutions

Answer 12

No change in properties of the components occur when they are mixed to form the solution
No heat, shrinkage or expansion

Question 13

Non ideal solutions

Answer 13

Heat is involved, expansion or shrinkage occur during mixing

Question 14

Saturated solutions

Answer 14

Maximum amount of solute has been dissolved

Question 15

Unsaturated solution

Answer 15

Solute can dissolve in the given amount of solvent at a particular temperature

Question 16

Supersaturated

Answer 16

More solute is dissolved, increase in size as particles precipitate onto the crystal

Question 17

Electrolyte

Answer 17

When dissolved in water, results in a solution that cna conduct electricity
Strong = ionize completely

Question 18

Nonelectrolyte

Answer 18

When dissolved, results in a solutions that does not conduct electricity
Do not yield ions when dissolved

Question 19

Advantages of solutions

Answer 19

Completely homogenous dosage
Immediately availability
Any route
Easily adjusted

Question 20

Disadvantages of solutions

Answer 20

Less stable
Not soluble
Poor taste
More difficult to handle, package and transport
Less accurate dosage