a buffer solution is prepared from an acid of dissociation constant2×10 raise to power minus 6 and its sodium salt.what will be molar ratio of salt to qcid per litre in a buffer solution of ph 6.8
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Answered by
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Answer:
The expression for the pH of the acidic buffer solution is as given below.
pH=pK
a
+log
[acid]
[salt]
pH=4.4
[acid]
[salt]
=
2
1
Substitute values in the above equation.
4.4=pK
a
+log(
2
1
)
Hence, pK
a
=4.7
pK
a
=−log(K
a
)=4.7
Hence, K
a
=2×10
−5
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