Diprotics and Titrations

diprotic species

2 pKa values, 2 protons

diprotic species graphs cross in ____ place(s)

2

for graphs, pKa is where the

prot and dep cross

for diprotic, label pKa values from ___ to ___ acidic

most, least

proton loss is

sequential

pKa1 = loss of ___ proton

first

pKa2 = loss of __ proton

second

loss of first proton equation

H-H

loss of second proton equation

ICE, Ka = x² / F — x

loss of second proton _____ to pH

does not contribute significantly

partially protonated (double agent) equation

[H₃O⁺] = square root (Ka1 x Ka2 x F + Ka x Kw / Ka1 + F)

For a solution containing fully and partially dep species, use

H-H equation, pKa₂

When using a strong acid or base, the reaction will go to

full completion

a protonated unknown will have a pH __ 7

<

a deprotonated unknown will have a pH ___ 7

>

for a titration curve, pKa = pH at

midpoint before the loss of a proton

an acid is fully deprotonated when the

#mols base = #mols acid