Terephthalic (C8H6O4) is a diprotic acid with pka's 3.51 and 4.82. a. What is the pH of a 0.15M solution of this acid? [x1] ( write answer to hundredths place) b. What is the concentration of C8H4O4-2 in a 0.15M solution f this acid? [x2] ( write answer to three significant figures and use "E" to write exponent) I think (a) pH is 2.18 but I need concentration. |
a) Answer :-
...(A)
Given :-
[C8H6O2] = 0.15 M
pKa1 = 3.51 and pKa2 = 4.82
We know that,
ie.
therefore,
Now, for equilibrium (A) the ICE table is
+ | + | ||||||
initial | 0.15 | - | 0 | 0 | |||
change | 0.15 - x | +x | +x | ||||
equilibrium | 0.15 - x | x | x |
Now,
i.e
but 0.15 >>x ie.
i.e
Now,
-------------------
b) Answer :-
Again
The ICE table is
+ | + | ||||||
I | 0.00681 | - | 0.00681 | 0 | |||
C | 0.00681 - x | - | 0.00681 + x | + x | |||
E | 0.00681 - x | - | 0.00681 + x | x |
Now,
but,
therefore,
ie.
ie.
------------------
Note:-
we can calculate pH using these two values of H3O+ concentration which also gives same value of pH
ie. [H3O+] =
ie.
Terephthalic (C8H6O4) is a diprotic acid with pka's 3.51 and 4.82. a. What is the pH of a 0.15M solution of this aci...
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