# Problem: 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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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?

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Weak Acids concept. If you need more Weak Acids practice, you can also practice Weak Acids practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofTrimethylamine, N(CH3)3, is the molecule that is responsible...as high difficulty.

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What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Goldsby's class at FSU.