A monobasic acid solution has pH value of 5. It's molarity is 0.005M. the degree of ionisation of the acid
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Answer:
Given that a weak monobasic acid (say HA) has a pH value of 5 and concentration of 0.005 M.
We know pH=−log [H
+
]=5
Hence, [H
+
]=10
−5
The ionisation reaction is as follows:
HA ⇋ H
+
+A
−
(1−α)c αc αc
Here, α is the degree of ionisation and c is the concentration of an acid.
The relationship between degree of ionization and concentration is α=
c
[H]
+
On substituting values in the above equation, we get
α=
0.005
10
−5
=2×10
−3
Hence, the degree of ionisation is 2×10
−3.
Explanation:
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