Water solubility question

[degenha7]

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I'm taking the DAT next week, but am slightly confused with what molecules are H2O soluble. I understand H-bonding and polarity make molecules H2O soluble.

Re: H-bonding, is any molecule with an F, O, or N H2O soluble, even if not directly bonded to an H?

So would that make molecules like CH2Cl2 H2O soluble?

 

[Aspiration]

I'm taking the DAT next week, but am slightly confused with what molecules are H2O soluble. I understand H-bonding and polarity make molecules H2O soluble.

Re: H-bonding, is any molecule with an F, O, or N H2O soluble, even if not directly bonded to an H?

So would that make molecules like CH2Cl2 H2O soluble?

As long as that F,O, or N has a dipole...I think it's capable of hydrogen bonding with water (I think only one of the two interacting molecules has to have a HF, HO, or HN bond while the other needs an F, O, or N with a dipole). But I suppose dichloromethane would be slightly soluble because of the slight dipole from the non-linearly arranged Cl groups?

but dichloromethane wouldn't be capable of H bonding, no.

 

[Illfavor]

Once thing primarily governs solubility, and that is polarity. "Like dissolves like." Polar solutes are soluble in polar solvents, and the opposite. So just ask, "Is this polar (even a little)?" That principle will guide you to the correct answer the majority of the time.