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Supernate Lab

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Me and my lab partner Ariana camper had unknown solution C. we had 8 ions but we only used five out of the 8 and the five we used to be pb2+,Fe3+,Ca2+,NH4+ and Na+. we figured out that our solution had Lead, because during the experiment we separated the supernate and the precipitate; we retrieved the supernate and added 1M K2CrO4. As swiftly as possible we added K2CrO4 to the supernate. soon as I did that it turned yellowish rapidly. although, we had tested Ag+ we had no precipitate form in our solution. accordingly, we did not have to test for Ag+ since no precipitate formed and skipped the entire process for Ag+. carrying on to the next step we had to test for iron. Before we can start testing for iron. I had to prepare the solution, preparing the solution contained taking the supernate that we made from group one and adding the following; NH4Cl, NH3, water and (NH4)S to the solution along with adding …show more content…

once we did that we added HCl to the precipitate. Then we had to centrifuge the solution and put the supernate into two test tubes to test for ions and nickel. In the experiment, we tested positive for iron but then tested for nickel and didn’t get anything. The reason behind this was when we added .2M KSCN to our supernate and turned it a dark red color swiftly. after we added NH3 to the solution, a precipitate formed for nickel. we mixed everything together which formed an orange specks of precipitate formed. we tested calcium and in our unknown we did have calcium. precipitate formed when we added K2C2O and NH3 to the supernate. Then, we did flame test and we see a color changed to see if calcium appeared which it

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