Chem Lab

Topics: Solubility, Precipitation, Solid Pages: 4 (1201 words) Published: February 20, 2013
Qualitative Analysis Lab
Solubility Data Table
Cations| Ag+| Pb2+| Cu2+| Ni2+| Ba2+|
NaCl| White ppt, AgCl(soluble in 12M HCl, soluble in sln of good complexing agent, 6M NH3)| White ppt, PbCl2(soluble in hot water, soluble in 12M HCl, soluble in sln of xs NaOH)| Soluble – no ppt| Soluble – no ppt| Soluble – no ppt| Na2CO3| White ppt, Ag2CO3(soluble in 6M HCl, soluble in sln of good complexing agent)| White ppt, PbCO3(soluble in 6M HCl, soluble in sln of good complexing agent)| Blue ppt, CuCO3(soluble in 6M HCl, soluble in sln of good complexing agent)| Green ppt, NiCO3(soluble in 6M HCl, soluble in sln of good complexing agent)| White ppt, BaCO3(soluble in 6M acetic acid, soluble in 12M HCl)| NH3| Brown ppt, Ag2O(soluble in xs NH3 as Ag(NH3)2+)| White ppt, Pb(OH)2(soluble in 6M HCl, soluble in sln of good complexing agent)| Pale Blue ppt, Cu(OH)2(soluble in xs NH3 as Cu(NH3)42+, deep blue complex| Blue-purple color of Ni(NH3)62+ complex| ?| NaOH| Brown ppt, Ag2O(soluble in 6M HCl, soluble in sln of good complexing agent)| White ppt, Pb(OH)2(soluble in 6M HCl, soluble in sln of good complexing agent,sol. in xs NaOH)| Pale Blue ppt, Cu(OH)2(soluble in 6M HCl, soluble in sln of good complexing agent)| Green Gel becomes crystalline upon standing, Ni(OH)2| ?| S2- (acidic pH = 0)| Black ppt, Ag2S(soluble in hot 6M HNO3)| Black ppt, PbS(soluble in hot 6M HNO3)| Black ppt, CuS(soluble in hot 6M HNO3)| No ppt| | S2- (basic pH = 9)| Black ppt, Ag2S(soluble in hot 6M HNO3)| Black ppt, PbS(soluble in hot 6M HNO3)| Black ppt, CuS(soluble in hot 6M HNO3)| Black ppt, NiS(soluble in hot 12M HCl)| | Perform the Separation/Identification Experiment as follows; • Read through the Discussion and Cations sections on pages 450 to 452, skipping the last paragraph on page 452. This is where you will get your Purpose Statement and Background information for your Prelab. Do the Prelab questions 1, 2, 3, 4 on pages 435 and 436. Also do...
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