Which buffer solution comprising of the following has its pH value greater than 7?
A
CH3COOH+CH3COONa
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B
HCOOH+HCOOK
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C
CH3COONH4
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D
NH4OH+NH4Cl
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Solution
The correct option is DNH4OH+NH4Cl The pH value of a basic buffer is always greater than 7.
Among the given options, NH4OH+NH4Cl is the only mixture which consists of a mixture of a weak base and its conjugated salt and thus, has a pH greater than 7.