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The diagrams here represent three different weak base solutions of equal concentration. List the bases in order of increasing $K_{\mathrm{b}}$ value. (Water molecules are omitted for clarity.)

$$(c)<(a)<(b)$$

Chemistry 102

Chapter 15

Acids and Bases

Liquids

Rice University

University of Kentucky

Brown University

Lectures

03:07

A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. As such, a liquid is one of the four fundamental states of matter (the others being solid, gas and plasma). A liquid is made up of tiny vibrating particles of matter, such as atoms, held together by intermolecular bonds. Water is, by far, the most common liquid on Earth. Like a gas, a liquid is able to flow and take the shape of a container. Most liquids resist compression, although others can be compressed. Unlike a gas, a liquid does not disperse to fill every space of a container, and maintains a fairly constant density. A distinctive property of the liquid state is surface tension, leading to wetting phenomena.

04:38

A liquid is a state of matter in which a substance changes its shape easily and takes the form of its container, and in which the substance retains a constant volume independent of pressure. As a result of this, a liquid does not maintain a definite shape, and its volume is variable. The characteristic properties of a liquid are surface tension, viscosity, and capillarity. The liquid state has a definite volume, but it also has a definite surface. The volume is uniform throughout the whole of the liquid. Solids have a fixed shape and a definite volume, but they do not have a definite surface. The volume of a solid does not vary, but the volume of a liquid may vary.

01:57

The following diagrams rep…

05:21

The diagrams here show thr…

02:28

Acid Strength and $K_{\mat…

01:22

The following pictures rep…

0:00

00:42

Okay, so we have three diagrams and we have to list them in order of increasing K B value, the ionization constant. So let's just make sure we know what is. What does it stand for? It's the that HB plus value times the hydroxide ion concentration over the remaining base concentration, so that's what we're trying to do. So for each of these diagrams, let's just figure out what the KB value would be based on the number of particles air giving us. So what I mean is, so look at letter A. You'll find there's two H B plus molecules there, and there's two hydroxide molecules. And then there's four of the remaining base molecules, so two times two is four divided by four, so you get a value of one. So that's Letter A. So then, let's see the same thing For the B diagram. You'll see there's three of the H B pluses, which means there's also three of the hydroxide, my aunts, and there's also three of the remaining base molecules. Put it all together. Nine divided by three is three. So that's it, more than that's higher than a and then finally let her see, you've got only one of the H B plus molecules and you've got only one hydroxide molecule. You've got five base molecules, so that ends up being 1/5. So that's Ah, definitely smaller than the rest. So now we can easily order these from least the greatest. So see would be the least. And then a is the second least, and then the most is be so see day to be. There you go.

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