<p>Ok sorry if these are stupid questions, but. . .</p>
<p>how would the solubility of propylamine C3H9N compare with nitrogen gas? With silicon dioxide?</p>
<p>Why is I2's solubility really low, but NaI is very soluble? </p>
<p>Thank you.</p>
<p>Iodine v. sodium iodide is easier to talk about.</p>
<p>Always remember this rule in solubility: LIKE DISSOLVES LIKE!</p>
<p>Water is a polar substance (hydrogen bonding), and if you compare the electronegativity difference between the two iodines, you'll find that the difference is zero, making it a covalent (nonpolar) substance. However, the difference between sodium's and iodine's is much higher (over 1.4 or something), so it must be a polar substance. Therefore, using like dissolves like, we can determine that polar NaI can dissolve in polar water.</p>
<p>I'd expect that propylamine would have a lower solubility than nitrogen gas because both are nonpolar molecules and propylamine is much larger. (Though it's been a year since I've taken the course, so take my words with a grain of salt.)</p>
<p>Thank you. Unfortunately, CC was messed up so I couldn't check this thread!</p>
<p>I never even thought about polarity and then I'm like duh! </p>
<p>Thanks!</p>