(b) If you were to put HBr under very high pressure, so its bond length decreased significantly, would its dipole moment increase, decrease, or stay the same, if you assume that the effective charges on the atoms do not change?

Video transcript

hi everyone for this problem were asked to identify what would happen to the dipole moment of Hydrofluoric acid. If it is put under a great amount of pressure such that the bond length decreases significantly. Okay, so for this problem we're going to need to recall that charge is equal to die pole moment over bond length. Okay. And this question specifically is asking us what happens to the dipole moment. So we need to rearrange this equation so that it solves for dipole moment. So let's multiply both sides of our equation by bond length. And when we do that, our bond length cancels on the right side and we get that our di pole moment is equal to our charge times our bond length. Okay. And we're being asked what happens to the dipole moment when the bond length decreases. Okay, so the two variables we're looking at here is dipole moment and bond length and here they have a direct relationship. And so if one increases the other increases, if one decreases the other decreases here, they're specifically telling us that the bond length decreases. So that means that what would happen to the dipole moment is that it is also going to decrease and that is our answer. Our di pole moment is going to decrease when the bond length decreases significantly. Okay, that's the end of this problem. I hope this was helpful