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Solution: Each of the following acid–base reactions involves substance...

Question

Each of the following acid–base reactions involves substances found in Table 1.8. Use the pKa data in the table to help you predict the products of the reactions. Use curved arrows to show electron flow. Predict whether the equilibrium lies to the left or to the right and calculate the equilibrium constant for each reaction. 

Video Transcript

So, let's look at this reaction going on up here at the top, let's figure out what's actually happening here and then we're going to figure out the equilibrium, so we've got this alkyne, right? With what equivalents of our NH2 negative, so what's going to happen here, right? Is that we're going to go ahead and grab one of these hydrogens and kick electrons onto the carbon, right? So what we end up with is our HC, triple bond, C, lone pair with a negative charge, right? And then we end up with our NH3 neutral with just one lone pair, so now my question is in which directions does equilibrium lie? Well, in order to figure out we need to look at our pka's, so we look at the pka's of our acids pKa of our alkyne right here we know it's 25 and then the pKa of our neutral amino and our Neutral ammonia here is and is 38, right? So we know that when we look at reaction like this we're going to go from more acidic to less acidic, which tells me that our equilibrium lies in the right direction, okay? We're going to go more towards the products. Alright. So guys, if you have any questions, let me know, if not, let's move on.

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