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A 168.5 mL sample of 0.087 M HCl is mixed with 50.2 mL of 0.089 M...

A 168.5 mL sample of 0.087 M HCl is mixed with 50.2 mL of 0.089 M NH3. What is the resulting pH? (The Kb for NH3 = 1.8 x 10^5).

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