Fe3+ (aq), Ca2+ (aq) and Ba2+ are all present in the same solution. Fully describe a procedure whereby you could separate these ions from one another
look at your solubility chart http://chemistrybrain.files.wordpress.com/2011/05/solubility_chart.jpg
Check your chart with this:
what happens if you make the OH ion strong? Doesnt that precipated the Ca, and Fe? filter those off, leaving the Ba ion in the solute.
Add water to the filtrate, add just a tad of sulfuric acid to dissolve one, and the other does not dissolve (check your chart).
To separate Fe3+ (aq), Ca2+ (aq), and Ba2+ from one another in a solution, a combination of precipitation and selective complexation reactions can be used. Here's a procedure that can be followed:
1. Add sodium hydroxide (NaOH) solution to the mixture gradually while stirring. This will cause precipitation of Fe(OH)3 as a reddish-brown precipitate according to the following reaction:
Fe3+ (aq) + 3OH- (aq) → Fe(OH)3 (s)
2. After allowing the mixture to settle, filter the solution to separate the solid precipitate (Fe(OH)3) from the remaining solution. The filtrate will contain Ca2+ (aq) and Ba2+ (aq).
3. To separate Ca2+ (aq) from Ba2+ (aq), add ammonium carbonate (NH4)2CO3 to the filtrate. It will selectively precipitate CaCO3 according to the equation:
Ca2+ (aq) + CO3^2- (aq) → CaCO3 (s)
4. Allow the mixture to settle and filter once again to collect the solid precipitate of CaCO3. The remaining filtrate will contain Ba2+ (aq).
5. To separate Ba2+ (aq) from the filtrate, you can utilize selective complexation by adding a solution containing sodium sulfate (Na2SO4). It will form a precipitate of BaSO4, according to the equation:
Ba2+ (aq) + SO4^2- (aq) → BaSO4 (s)
6. Allow the mixture to settle again and filter to obtain the solid precipitate of BaSO4.
By following this procedure, you can successfully separate Fe3+ (aq), Ca2+ (aq), and Ba2+ from one another in the solution. It is essential to carefully handle the chemicals and perform the steps in a properly equipped laboratory to ensure safety.