Chromic acid, H2CrO4 is a diprotic acid,
with pKa values of 0.86 and 6.51. Calculate the total alkalinity
for a water sample containing 10-3 M Na2CO3
and 10-4 M H2CrO4
Phosphoric acid is a triprotic acid, and the Ka values are given
below. Calculate pH, pOH, [H3PO4], [H2PO4 2- ], [HPO4 - ], and [PO4
3- ] at equilibrium for a 5.00 M phosphoric acid solution.
Ka1 = 7.5 x 10-3
Ka2 = 6.2 x 10-8
Ka3 = 4.2 x 10
An enzyme contains an active site aspartic acid with a pka=5.0
which acts as a general acid catalyst. Draw the curve of enzyme
activity vs. pH for the enzyme (assume the protein is stably folded
between pH 2-12 and that the active site Asp is the only ionizable
residue involved in catalysis).Explain the shape of the curve