Transcript pH - Paradise High School

•
pH stands for ~ “partial
hydrogen ions, therefore…
•
It is a measure of H+
concentration in a solution.
oAcid = A substance that
donates/release H+ in solution.
oBase = A substance that reduced the
amount of H+ in solution.
Two ways to do this:
1)Solute being dissolved accepts
H+
2)Releases OH-
Molecular
Enzyme
stability
activity
Membrane
function
Rise in pH
H2CO3
HCO3-
+
H+
Drop in pH
(donor)
(Acid)

(acceptor)
(Base)
This is the buffering system in human blood.
Carbonic Acid (H2CO3) & Bicarbonate ion (HCO3-)
o Why does carbonic acid come apart?
A: WATER
o Where does the carbonic acid come
from?
A: CO2 + H2O ; products of cellular
respiration
Blood pH = 7.4 ; more than a pH change of
+/- 0.2 in blood = death!