Salt Solubility in Water

[seraphkz]

Hey guys, I have an odd question...

Is there a way to determine the relative solubility by just looking at the Van't Hoff Factors?

Let's say we want to determine the relative solubility between NaCl and CaCl2. Which one is more soluble?

Do we need to know their molar solubility or can we just come to a conclusion based on:

NaCl ( Van't Hoff Factor i = 2)
CaCl2 (Van't Hoff Factor i = 3)

Is there a relationship between i and solubility in water?

Thanks.

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[Rabolisk]

Vant hoff factor measures how many particles result from dissolution. It doesn't tell you anything about solubility itself, only how many ions will be generated if it is dissolved. You would have to look at molar solubility or Ksp.

 

[seraphkz]

Thank you. This is what I thought.

But for some crazy reason, I recall going over one of the solubility questions I did in the past and it involved looking at the value of i.

It said something about how van't hoff factor is involved in Osmotic pressure. Osmotic Pressure = MiRT. And from there, it somehow linked to solubility. I can't find where I did that problem though.

=\

 

[GRod18]

well maybe its trying to point that that you are using molarity (moles/liter solution) when you are doing osmotic pressure vs, you are using molality (moles/kg solvent) if you are are doing other colligative properties.