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What is the pH of a solution made by mixing 25.0 mL of `1.00xx10^(-3)` M `HNO_3` and 25.0 mL of `1.00xx10^(-3) M NH_3` ? [`K_b` for `NH_3=1.8xx10^(-5)

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What is the pH of a solution made by mixing 25.0 mL of `1.00xx10^(-3)` M `HNO_3` and 25.0 mL of `1.00xx10^(-3) M NH_3` ? [`K_b` for `NH_3=1.8xx10^(-5)`]
A. 4.02
B. 6.28
C. 7.72
D. 9.98
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Correct Answer - b
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