Level 120 Level 122
Level 121

pH Values of Buffer Solutions


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what does the pH of a buffer solution depend on?
the acid dissociation constant, Ka, of the buffer solution and the concentration ratio of the weak acid and its conjugate base
[H+(aq)] = Ka * [HA(aq)]/[A-(aq)]
give the equation for [H+(aq)] when working out the pH of a buffer solution
Ka = [H+(aq)][A-(aq)]/[HA(aq)]
give the equation for Ka
pH = -log[H+(aq)]
give the equation for pH
the carbonic acid - hydrogencarbonate ion buffer
which is the most important buffer system in the blood?
H2CO3
Carbonic Acid
HCO3-
give the formula for hydrogencarbonate
4.3 * 10^-7 mol dm-3
what is the acid dissociation constant for the carbonic acid - hydrogencarbonate ion buffer equilibrium?
aqueous carbon dioxide, which is then exhaled
when acid is added to the blood, what is the carbonic acid converted into?
7.2 - 7.6
what pH range of the blood is healthy?
polar molecule
A _______ is one whose centers of positive and negative charge do not coincide. Thus, a polar molecule has a positive side and a negative side.
cohesion
attraction of molecules to each other
adhesion
an attraction between molecules of different substances
surface tension
a measure of how difficult it is to break the surface of a liquid
specific heat of a substance
is the amount of heat per unit mass required to change its temperature by 1 degree C
solvent
A _______ is a substance that can dissolve other substances.
solute
A _______ is a substance that dissolves in a solvent to make a solution.
aqueous solution
a solution in which water is the solvent
hydration shell
The sphere of water molecules around each dissolved ion
hydrophilic
Attracted to water, soluble in water.
Hydrophobic
hates water