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A buffer solution was prepared by mixing 300.0 mL of a 0.200 M solution of hydroxylamine...

A buffer solution was prepared by mixing 300.0 mL of a 0.200 M solution of hydroxylamine (OHNH2, Kb = 1.1 × 10-8) and 250.0 mL of a 0.300 M solution of its hydrochloride salt (OHNH3+ Cl- ). Calculate the pH of the solution after the addition of 1.08 g of solid NaOH (molar mass = 40.00 g/mol). Assume that there is no volume change upon the addition of solid.

A.

8.22   

B.

5.55

C.

6.30

D.

5.78

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