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

Explanation:

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In this case, ammonia dissociation is:

So the equilibrium expression:

That in terms of the reaction extent and the initial concentration of ammonia is written as:

Thus, solving by using solver or quadratic equation we find:

Which actually equals the concentration of hydroxyl ion, therefore the pOH is computed:

And the pH from the pOH is:

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