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September 1, 2014

Homework Help: Chemistry - solubility

Posted by Belinda on Tuesday, January 2, 2007 at 7:21pm.

Arrange the following compounds in order of increasing solubility in water:

* O2
* LiCl
* Br2
* CH3OH

Like dissolves like; that is, polar compounds usually are soluble in water and non-polar compounds are not soluble in water. From that description, make your choices and post what you think. We can help you from there. OR, tell us what you don't understand about the question.

So, O2 is nonpolar, and is therefore not soluble. Br2 is also nonpolar, so how do I know which one is more soluble? LiCl is ionic - does that mean it is soluble? I know NaCl is soluble and that's an ionic compound. CH3OH has some polar and nonpolar bonds. Where do I go from there?

You are right that oxygen is only slightly soluble in water. Bromine reacts with water to form HOBr and HBr so there is more solublity there. LiCl, if it is ionic, must be polar and (you did well to compare with NaCl because both Li and Na are in group IA of the periodic table) so you would expect LiCl to be quite soluble. Methyl alcohol is essentially miscible with water in all proportions (see the OH group on CH3OH and note HOH has the same OH from water). So it is an educated guess as to which, LiCl or CH3OH, has the greater solubility. I looked up LiCl and 1 gram will dissolve in 1.3 mL cold water or 0.8 mL hot water (VERY soluble). I believe CH3OH is miscible ihn all proportions so I would rank it higher. However, you form your own conclusion.

so it would be O2, Br2, LiCl, CH3OH. Very confusing.

Br2
CH3OH
LiCl
O2

What is the I- concentration just as AgCl begins to precipitate when 1.0 M AgNO3 is slowly added to a colution containing 0.020 M Cl- and 0.020 M I-?

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