ph of 01 ch3cooh what will be the ph of the solution if 3 times its volume of 0.01 m nacl is added into it?
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What is the pH of a 1 M CH
3
COOH solution?
[K
a
of acetic acid=1.8×10
−5
, K
w
=10
−14
mol
2
litre
−2
]
Hard
Solution
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Correct option is D)
CH
3
COOH⇆CH
3
COO
−
+H
+
For weak acid CH
3
COOH, by applying ostwald's dilution law equation,
[H
+
]=
(C×K
a
)
By substituting values in the above equation, we get,
[H
+
]=
(1×1.8×10
−5
)
=0.004243M
The pH is negative logarithm of hydrogen ion concentration.
pH=−log[H
+
]=−log(0.004243)=2.4.
=2.4
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