solubility

[mcgill2012]

how important is memorizing the solubility rules?
also, if a salt is completely soluble, this means that the concentration of each species is the same as that of the salt (in stoichiometric proportions), correct? similar to dissociation of a strong acid/ base

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[Rabolisk]

I have yet to see a question where you truly had to make a tough judgment call between two salts. Google solubility rules and you'll get all sorts of charts/tables/songs/mneomincs to help you memorize them.

If a salt is completely soluble, the concentration of each species may be greater than the concentration of the salt, because the salt could dissolve to make more than just a cation and an anion.

For example, CaCl2 -> Ca2+ + 2Cl-
You get 2 Cl- per CaCl2, hence the concentration is twice the formal concentration of CaCl2.

 

[sangria1986]

how important is memorizing the solubility rules?
also, if a salt is completely soluble, this means that the concentration of each species is the same as that of the salt (in stoichiometric proportions), correct? similar to dissociation of a strong acid/ base

most basic rules are these:

all no3- are soluble. all K, Na and NH4+ are soluble. Most Cl- are soluble except Pb+, Hg, and Ag.

Most SO4 are soluble except Ca, Ba, and Pb.

Most hydroxides are NOT soluble..exceptions are Na, K, and Ca.

Most sulfides2-, carbonates CO3-2, and phosphates PO4-3 (is it -3? not sure) are not soluble.

by not soluble I mean very slightly soluble to not soluble. these are basic rules you should know, much like HC and HNO3 are strong acids.


the

 

[sangria1986]

on that note can anyone list some common oxidizing and reducing agents?

I'll start ( only common ones please)

CrO4, ClO4 (oxidizing)

reducing (LiAlH4)

 

[Bali]

anything with a bunch of oxygens = probably oxidizing agent

anything with a bunch of hydrogens (or if you know its a redox, lack of oxygens) = probably reducing

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