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Labs 8-15

Various definitions

TermDefinition
Colloid A homogenous mixture that does not separate or settle out. The particles will pass through a filter but not a semi-permeable membrane.
Solution A homogenous mixture of two or more substances
Semipermeable membrane allows solvent molecules such as water and very small solute particles to pass through.
Suspensions Contain very large size solute particles. These particles can be seen without a microscope making it heterogeneous.
Osmosis Passage of solvent through a semipermeable membrane.
Dialysis Passage of small particles as well as water through a semipermeable membrane.
KSCN Used to test the presence of FeCl3. Red is a positive result.
Iodine Used to test for the presence of starch. A blue-black color is a positive result.
Tyndall Effect The ability of light to shine through a solution. Readings can be from strong to dim light. It shows how dense the particles are in the suspension.
Acid A substance that ionizes and produces H+ ion when dissolved in water.
Base A substance that produces OH- when dissolved in water or an H+ acceptor.
Ammonia shown as a base A water molecule has to be included as a reactant.
Buffer A solution that will resist changes in pH when small amounts of acid or base are added.
Buffer systems Comprised of a weak base and the salt of a weak base.
Example of weak acetic acid HC2H3O2 (acetate) --> acetic acid
Three common buffers that regulate the human body carbonate system, phosphate system and the protein system
Blue base
Red acid
Solute concentration Amount of solute dissolved in a certain amount of solvent or solution.
Molarity Number of moles of solute per liter of solution and is given the symbol M.
Molar mass
Created by: daydreamer67