Name: Anonymous 2006-05-27 23:39
Ok guys, for my Chemistry class I need to identify a bunch of ionic solutions. We first got a set of seven solutions, namely Barium chloride (BaCl2), Cobalt (II) chloride (CoCl2), Sodium hydroxide (NaOH), Aqueous ammonia (NH3), Sulfuric acid (H2SO4), Sodium carbonate (Na2CO3), and Copper (II) sulfate (CuSO4). I was able to identify the CuSO4 because copper solutions are always blue, and we were told that when CuSO4 mixes with NH3, it forms a deep blue substance. By that I was able to find out the NH3. I also found some other ones by finding which ionic componds would form precipitates with the compounds I already knew, and in the end I was able to find them all.
SET NUMBER II (dun dun dun)
Using the previous set, we now have to find out six more solutions: Zinc nitrate (Zn(NO3)2), Sodium chloride (NaCL)(salt), Iron (III) nitrate (Fe(NO3)3), Magnesium sulfate (MgSO4), Aluminum chloride (AlCl3), and Potassium thiocyanate (KSCN). Since CoCl2 and KSCN form a deep blue substance, I took the CoCl2 that I had identified earlier and mixed it with each of the six new compounds. The one that formed deep blue I identified as the KSCN. Then, I mixed the KSCN with the five other unknowns, and the one that formed a red color I identified as Fe(NO3)3 because they also combine into a red substance. This leaves me with 4 unknowns. I am especially worried about how I am supposed to identify the NaCl. Does NaCl react with ANYTHING? We are allowed to ask for one outside compound in an aqueous form to identify these chemicals. What should I ask for? How can I tell apart NaCl and AlCl3? Basically, my question is how do I identify Zn(NO3)2, MgSO4, NaCl, and AlCl3 using only the other known chemicals, one outside chemical, a thermometer, and an couple of acid-base indicators?
SET NUMBER II (dun dun dun)
Using the previous set, we now have to find out six more solutions: Zinc nitrate (Zn(NO3)2), Sodium chloride (NaCL)(salt), Iron (III) nitrate (Fe(NO3)3), Magnesium sulfate (MgSO4), Aluminum chloride (AlCl3), and Potassium thiocyanate (KSCN). Since CoCl2 and KSCN form a deep blue substance, I took the CoCl2 that I had identified earlier and mixed it with each of the six new compounds. The one that formed deep blue I identified as the KSCN. Then, I mixed the KSCN with the five other unknowns, and the one that formed a red color I identified as Fe(NO3)3 because they also combine into a red substance. This leaves me with 4 unknowns. I am especially worried about how I am supposed to identify the NaCl. Does NaCl react with ANYTHING? We are allowed to ask for one outside compound in an aqueous form to identify these chemicals. What should I ask for? How can I tell apart NaCl and AlCl3? Basically, my question is how do I identify Zn(NO3)2, MgSO4, NaCl, and AlCl3 using only the other known chemicals, one outside chemical, a thermometer, and an couple of acid-base indicators?