Q.

In a buffer solution consisting NaH2PO4 and Na2HPO4

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a

The pH of solution can be calculated using the relation pH=pK2+log[HPO42][H2PO4]

b

The pH cannot be calculated.

c

The NaH2PO4 is acid and Na2HPO4 is salt

d

The Na2HPO4 is acid and NaH2PO4  is salt

answer is A, B.

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Detailed Solution

The more acidic is considered as acid. In this case NaH2PO4 is more acidic so it is acid. The other species is salt. The equilibrium constant to be used in hendersons equation for calculating pH should be one relating to the acid specices to its salt i.e., H2PO4HPO42+H+  So K2 is the relevant equilibrium constant and the given equation can be used to calculate pH .

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