Trimethylamine, N(CH3)3, is the molecule that is responsible for the “fishy smell” of seafood. It has a Kb of 6.3 x 10 -5, making it a moderately-strong weak base.
A. Write a balanced chemical equation showing how N(CH 3)3 acts as a weak base in water.
B. Now consider the ionic compound HN(CH 3)3Cl, formed by reacting N(CH3)3 with HCl. In water, HN(CH3)3Cl separates into HN(CH3)3+(aq) and one of our favorite spectator ions, Cl -(aq). Calculate the pH of 0.18 M HN(CH 3)3Cl.
1. Write a balanced chemical equation for the acid-base reaction your calculation is based on. You do not need to include Cl‒(aq) because it is a spectator.
2. Determine the pH of this solution.
3. Is the pH you calculated consistent with the chemical equation you wrote for Part B.1?
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