This video, we're going to take a look at amine reactions through the prism of acid-base reactions. Now under this type of reaction, an acid reacts with an amine, which represents a weak base. Now recall, when a base accepts an H+, it transforms into a conjugate acid. This conjugate acid of an amine is called the Ammonium ion. Now, here we're going to say for the Ammonium ion, we modify the ending of amine, which is the neutral form of our amine, to ammonium ion. So if we take a look here at this generic amine reaction, we have Methylamine as our starting amine, it's reacting with hydrochloric acid which is an acid. We know following the Brønsted definition that the acid donates an H+ to the base. So when it accepts that H+, it's now accepting an H+, so now nitrogen is making 4 bonds, so it's going to be positively charged. And we're going to say when a nitrogen is positively charged by making 4 bonds, that's when the moniker of Ammonium ion comes into play. So we're going from methylamine to methyl ammonium ion. Okay, so this would be the name of our newly created ammonium ion product.
Amine Reactions - Online Tutor, Practice Problems & Exam Prep
Acid-Base Reaction Concept 1
Video transcript
Acid-Base Reaction Example 1
Video transcript
Predict the products formed from the following reaction between nitric acid and ammonia. Right. So nitric acid is our acid, ammonia is our neutral amine, so it's a weak base. Here, we're using the Bronsted-Lowry definition. We know that the acid donates an H+. So when that acid donates an H+, it forms a conjugate base, so it's going to form the nitrate ion, and then ammonia gains an H+ to become NH4+, so it becomes the ammonium ion. In addition to this, notice that there is a solid arrow going forward because we have a strong species mixing with a weak species. Nitric acid is a strong acid, mixing with ammonia which is a weak base. When a strong species, acid or base is involved, we have complete formation of our products, so we have a solid arrow going forward. Okay? But in this particular example here, we're going to say our Nitrate ion and Ammonium ions are our products created between the reaction of nitric acid and ammonia.
Determine the ammonium ion formed in the following reaction between diethylamine and hydrobromic acid.
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