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a buffer is prepared by mixing 500 ml of 0.2 M Na2HPO4 with 500 ml of...

a buffer is prepared by mixing 500 ml of 0.2 M Na2HPO4 with 500 ml of 0.4 M NaH2PO4.
a) what is the pH of this buffer
B) if 10ml of 1 M HCL was added to this buffer what change in pH would be observed (ignore any change in volume)
c) what would the final pH be if you added the same quantity of acid to 1 l of H2O (pH 7)

please show all steps

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