Calculate the pOH of a solution that results from mixing 46 mL of 0.11 M trimethylamine ((CH3)3N) with 17 mL of 0.13 M (CH3)3NHCl. The Kb value for (CH3)3N is 6.5 x 10-5.

Explanation:

The equation for the equilibrium is

Data:

Vb = 46 mL;      [B] = 0.11 mol·L⁻¹

Va = 17 mL; [BH⁺] = 0.13 mol·L⁻¹

Kb = 6.5 × 10⁻⁵

Calculations:

1. Calculate the moles of B and BH⁺

(a) Moles of B

(b) Moles of BH⁺

2. Calculate the pOH

The Henderson-Hasselbalch equation for a basic buffer is

(a) Calculate pKb

(b) Calculate the pOH

The components are in the same solution, so the ratio of the moles is the same as the ratio of the concentrations

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