Tu pH of a mixture of equal volumes of 0.2 M HCL and 0.2 M CH3COOH is____.
(a)2.0
(b)3.4
(c)4.7
(d)5.0
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Answer:
Whem equal volume volume of 0.02HHOCl and 0.2MCH
3
COOH are mixed.
New conc. of HOCl=
2
0.02
=0.01H
New conc of CH
3
COOH=
2
0.2
=0.1H
Now,
For a mixture of weak acids we know
[H
+
]=
Ka
1
C
2
+Ka
2
C
2
=
2×10
−4
×10
−2
+2×10
−5
×10
−1
=
4×10
−6
=2×10
−3
∴ph=3−log
2
=2.7
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