Question

1. Did the sodium acetate dissolve in water? If it dissolved, what sort of IM forces played a role? Explain and illustrate (draw the interactions).

my answer: So, sodium acetate is water soluble. The compound disocciates and forms Na+ ions and CH3COO- ions. These ions are then subject to water's strong polarity, so you will have some dipole-dipole interactions going on. Within those ions, you might have some dispersion forces going on as well, but those would be negligible.BUT i guess I am unsure how I am supposed to EXPLAIN & ILLUSTRATE the interaction…. is it like:

CH3COONa + H2O = CH3COO-(aq) + Na+(aq)

2. Predict if the following chemicals will be mostly soluble in water, ether, or both water and ether.

ammonium hydroxide, CH3CH2CH2CH2OH, CH3C6H4NH2, CH3C6H4NH3+HSO4- , CH3NH2, CH3(CH2)4COOCH3, CH3(CH2)8COOH, and CH3(CH2)8COO- Na+
@Photon

Answer 1

@Cuanchi

Answer 2

For the reaction you wrote for question 1 you usually don't have to include H2O its just
CH3COONa -->CH3COO-(aq) + Na+(aq)
I dont know what they mean by illustrate? Do they want you to draw how the H2O molecules would surround the specific ions?

Answer 3

that's a good start, but look at the IMF you've chosen: dipole-dipole. Is the sodium \(ion\) a dipole?

Answer 4

I'd guess they want you to draw the lewis structure of the acetate ion (if you've done lewis structures) and show the IMFs between the acetate ion and the water molecule

Answer 5

@sweetburger I am guessing they want to know the interaction b/t acetate ion and water...

Answer 6

@JFraser sodium acetate has ionic bonding?

Answer 7

If you were to draw this the positive Hydrogens on the H2O molecule would be pointing toward the acetate which is negative

Answer 8

it does, but what about the IMFs bewteen the sodium ion and water? and the acetate ion and water?

Answer 9

Yes @Summersnow8 but thats an intramolecular force.

Answer 10

What force is interacting in between the positive side of H2O molecule (which is the Hydrogen's) and the negative acetate ion?

Answer 11

hydrogen bonding, because H is being attracted to O?

Answer 12

because the positive H on the water is attracted to the big negative lone pairs on the oxygens of the acetate

Answer 13

@JFraser there would be a dipole-dipole interaction b/t water and the sodium ion, because O of H2O would be attracted to Na

Answer 14

it would be ion-dipole, because the sodium ion isn't a dipole, it's a point of positive charge only. The water molecule is a dipole, but the sodium isn't

Answer 15

there are lots of interactions going on, some for both ions

Answer 16

@JFraser so the IM forces that played a role are H bonding with sodium acetate and water and ion-dipole forces b/t the sodium ion and water?

Answer 17

the H-bonding occurs between the \(acetate\) ion and water, since the sodium acetate dissolves and dissociates, right?

Answer 18

the interactions would be illustrated as: