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Description:

AP Chemistry 1.4 Forming and Breaking Bonds. What is the correct expression for the equilibrium constant, K eq ?

Language:
English Language

Transcript

00:04

Here’s your Shmoop du jour, brought to you by The Jackson 5. They think everything is [Jackson 5 singing]

00:08

as easy as ABC, 123… Apparently they never took AP Chemistry. [Jackson 5 in a chemistry class]

00:14

Okay, enough singing and dancing…here’s our question:

00:18

Consider the following chemical reaction equation…

00:21

Using this equation, what is the correct expression for the equilibrium constant, Keq?

00:28

And here are the potential answers:

00:31

Okay, okay, maybe we were a little hard on those Jacksons. This one really is as easy

00:37

as ABC… D. Can’t forget D. [Jackson 5 in chemistry class and teacher shows A, B, C, D on board]

00:41

Anyway, let’s get to our question. The equilibrium constant for any chemical

00:45

reaction will always be the concentrations of the products divided by the concentrations

00:48

of the reactants, with each species raised to the power of its stoichiometric

00:54

coefficient. Yeah, where's your ABC, 123 now, Jackson Five? [Person taking photo's of Jackson 5]

00:57

So for this reaction, the equilibrium constant is C times D squared divided by A squared

01:03

times B cubed. But wait, there’s more! Call now, and you’ll [Man selling frying pans]

01:07

get a second full set of banana-shaped frying pans for free, just pay $89.95 processing

01:12

and handling! …Whoops. Sorry for the confusion, that’s

01:14

our other job… tough economic times, right?

01:19

But there actually is more… There’s an important trick to this question:

01:22

we also need to consider the phase of each reactant and product.

01:27

Remember that we only include the reactants and products that are in the gaseous state [Reactants and product put inside a box]

01:31

in the equilibrium constant. We exclude species that are liquids or solids.

01:37

That means we can’t include species C in the equilibrium constant expression.

01:41

So, if we revisit our previous expression for Keq but remove species C, which is a liquid, [Species C removed from formula]

01:47

we’re left with D squared divided by A squared times B cubed. And that’s choice B, the

01:52

correct answer. Now, who wants some banana-shaped blueberry

01:56

pancakes? If we’ve learned one thing today, it’s that this is a deal too good to pass [Man selling banana-shaped blueberry pancakes]

02:00

up – don’t wait, call now! …Sorry. We have to meet a quota.

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