Cells Biology Ch 3. Water Importance

assymetrical

polar

symmetrical

non-polar

water

H2O (polar)

an excellent polar solvent

water

A fluid in which something can be dissolved

Solvent

a substance dissolved in a solvent

solute

Solution that has water as the solvent

aqueous solution

Something that will mix with water and includes anything with an electric charge

Hydrophilic

Something will not mix with water and includes non-polar molecules (LDF)

Hydrophobic

Large molecules that have both hydrophilic and hydrophobic ends. Ex: Soap

Amphipathic

concentration = Amount of solute/Volume of solute (moles/L)

Molarity

Amount usually expressed in grams

Moles (mol.)

Concentration

Molarity (M)

Weight of one molecule

Molecular weight

Find the molecular weight and change the Da/AMU to grams

the way the find moles

Measuring the balance between H+ and OH-

pH

0-7

acidic, more H+

7-14

basic, more OH- alkaline

7

neutral

1 unit of pH represents a change of....

10 fold

Substances which add H+

Acid

substances which add OH-

Bases

Substance that help to maintain a constant pH. When there's a change, it will absorb or release H+ or OH-

Buffer

Specifies the pH at which the buffer

pKa