Is this a TBR mistake?

[discowisco]

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It says the molar solubility of CaCO3 is 9.3 x 10^-5 and CaF2 is 2.2 x 10^-4 and that CaF2 is more soluble.

Shouldnt the one with the smallest molar solubility, be the more soluble?

 

[ToldYouSo]

Higher value = greater number of moles that can dissolve per liter

 

[discowisco]

Yeah but does that mean more soluble?

It says in TBR in bold "The compound with he smallest molar solubilty precipitates first" thus doesnt that means smaller molar solubility = more soluble?

 

[milski]

Yes, it does.
2.2 x 10^-4 is larger than 9.3 x 10^-5 (=0.93 x 10^-4).
This means that CaF2 has higher value and is more soluble.

 

[discowisco]

Got it so basically Higher the molar solubility = MORE soluble.

And lower the molar solubility = LESS soluble thus that is is why it precipitates first?

 

[milski]

Got it so basically Higher the molar solubility = MORE soluble.

And lower the molar solubility = LESS soluble thus that is is why it precipitates first?

Yes, you've got it.

 

[PocketJacks]

Yeah but does that mean more soluble?

It says in TBR in bold "The compound with he smallest molar solubilty precipitates first" thus doesnt that means smaller molar solubility = more soluble?

"precipitates first" actually means "less soluble"