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Precipitates

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Kneelo:
Hi
If I mix Cr2(SO4)3 + NaOH a precipitate is formed , but I'm not sure which ! Is it Cr2OH or Na(SO4)3 any sugestions would be appreciated .
Thanks Kneelo

AWK:
Cr2(SO4)3 + 6NaOH = 2 Cr(OH)3(s) + 3Na2SO4

jdurg:
If memory serves me correctly, all alkali metal salts are soluble.  

AWK:
If memory serves me correctly, all alkali metal salts are soluble.  
 It depends on anion. KClO4, K2[PtCl6 ], K2Na[Co(NO2)6 ] are poor soluble, Na[Sb(OH)6 ], Li2CO3,
Rb2Na[Co(NO2)6 ], Cs2Na[Co(NO2)6 ] also. Poor solubility means in this case less than 1g/L, sometimes a few mg/L.

hmx9123:
Remember, everything is soluble, the question is how soluble.  Even things that you normally think of as incredibly soluble, like sodium chloride and sodium sulfate, can precipitate under the right conditions.  I have actually run a reaction before in which I had sodium sulfate precipitate out on me.  For a good look at inorganic solubilities, try the CRC handbook of chemistry and physics; the older editions contain inorganic compound solubility constants.  Lange's Handbook of chemistry also gives a lot of constants, but many are given as equilibrium constants.

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