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Help! It is saying that the pH is 9.26 but I'm not getting this value. Please...

Help! It is saying that the pH is 9.26 but I'm not getting this value.

Please show a step-by-step solution. Thank you.

A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution after the addition of 50.0 mL of HNO3. The Kb of NH3 is 1.8 × 10-5.

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