A 100.-mL sample of 0.10 M HCl is mixed with 50. mL of 0.10 M NH₃. What is the resulting pH? (K_b for NH₃ = 1.8 *10^-⁵)

Name: A 100.-mL sample of 0.10 M HCl is mixed with 50. mL of 0.10 M NH 3 . What is the resulting pH? (K b for NH 3 = 1.8 *10 - 5 )
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Question

Quizplus · Accepted Answer

The HCl and NH3 react to form NH4Cl. The moles of HCl (0.01 mol) exceed the moles of NH3 (0.005 mol), leaving 0.005 mol of HCl unreacted in a total volume of 150 mL. The concentration of HCl is 0.033 M, leading to a pH of approximately 1.48.

A 100-ML Sample of 0