The acetyl ion has a formula of mathrmc2 mathrmh3 mathrmo...

The acetyl ion has a formula of $\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{O}^{-}$ and two possible Lewis electron-dot diagram representations: (a) Using formal charge, determine which structure is the most likely correct structure. (b) For carbon atom " $\mathrm{x}$ " in the structure you chose: (i) What is the hybridization around the atom? (ii) How many sigma and pi bonds has the atom formed? (c) A hydrogen ion attaches itself to the acetyl ion, creating $\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}$. Draw the Lewis diagram of the new molecule.

Transcript

00:01 All right, so we're dealing with the formula c2h3o minus.

00:07 Let's see how many electrons we have and how many we want to determine how many bonds will form in our lewis structure.

00:14 So we have two carbons and each of those has six electrons, three hydrogens, which each have one electron, oxygen which has, oh, sorry, two carbons which have four electrons, and then an oxygen which has six.

00:32 And then we add one because of the negative charge.

00:35 So that's 8, 11, 18.

00:41 All right.

00:42 And then each carbon wants 8, each hydrogen wants 2, and the oxygen wants 8.

00:50 So that's 16, 24, plus 6 is 30.

00:56 So we need to share the difference of the 2, which is 12, or make 6 bonds each with 2 electrons.

01:07 So let's see, carbon can connect to the other carbon and then have these three hs coming off of it.

01:16 That's four bonds.

01:18 And then we could have a double bond to the oxygen like that.

01:24 Yeah.

01:29 And then is carbon only has six electrons around it, three bonds? so then it would need a lone pair like that.

01:35 That's one plausible structure.

01:37 Now, the formal charge on this carbon, it wants four electrons.

01:41 It has five around it.

01:43 So it's negative one.

01:44 All right, let's draw another structure, maybe put the oxygen in between the carbons.

01:48 That's another way to connect it.

01:50 And then we'd have, hmm, we only have three hydrants.

02:18 So that doesn't work well.

02:18 What if we made it an oh group? so it'd be like carbon, carbon, oh, h like that...

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