For this lab there is a solution that hascommon anions, carbonate, sulfate, phosphate, and sulfide. Theprocedure says to precipitate sulfate carbonate and phosphate. Theinstructions call for a 1.5 ml of the reference solution in a smalltest tube. If acidic add drops of 3M NH3 until the solution isbasic. Then it says to add 10-12 drops of .1M Ca(NO3)2 until theprecipitation of the anions occur.
The next step is to centrifuge the solution , decant the supernatant , wash the precipitate twice with deionized water.
To identify the sulfide ion add 2-4 drops of 6M HNO3 to the supernatant until solution is acidic and then drops of 1M Cu(NO3)2until precipitation is complete.
If HNO3 could not be found and I added6M HCl instead, what affect does this have on the test for sulfide ion. Explain. What affect does this have on subsequent tests of the supernatant? Explain.