There is no better time to learn the solubility rules then now. That's all it takes and a little practice helps of course. Here is a simplified version.
See below for an example of how to do these.
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Let's take Fe(NO3)3 and add the four solutions to it.
With HCl it could form FeCl3 but all chlorides are soluble except Ag, Hg2^2+ and Pb so this one is no ppt.
With NaOH this could form Fe(OH)3 and that is insoluble so you get a ppt.
With NH3 you get NH3 + H2O ==> NH4^ + OH^- so the Fe(OH)3 will ppt here, too.
NOTE: NH3 can have two roles. One is that is forms OH^- in solution and OFTEN ppts the hydroxide if that is insoluble; at other times it is the NH3 molecule that form a complex ion as in Cu(NH3)4++.
Fe(NO3)3 + H2SO4 might form FeSO4 but sulfates are soluble except for BaSO4, SrSO4 and sometimes CaSO4 so no ppt.
Solubility Rules!! Homework problem I desperately need help with
Solutions used: 6M HCl, 6M NaOH, 6M NH3, 3M H2SO4
Mixed with: Cr(NO3)3, Fe(NO3)3, Bi(NO3)3, Mg(NO3)2, Pb(NO3)2
please help me and tell me which form precipitates and which
1 answer
1 answer