set C is:
AgNO3(aq),Ba(NO3)2(aq),HCl(aq),H2SO4(aq), NaOH(aq)
What preliminary test result are you looking for to identify conclusively your unknown solutions as Set C? Explain.
I'm sorry but with no more information than you have provided I can't help. I went back to look at your earlier post of this and I see Dr. Russ asked for the contents of set C. However, we don't know what preliminary tests you are to do or that you have done. If you can provide the preliminary test we may be able to give some guidance.
To identify the unknown solutions as Set C, one preliminary test that can provide a conclusive result is the precipitation reaction between Ba(NO3)2(aq) and H2SO4(aq).
When Ba(NO3)2(aq) and H2SO4(aq) are mixed, a white precipitate of BaSO4(s) is formed if the solution contains sulfate ions (SO4 2-).
Hence, by adding Ba(NO3)2(aq) to the unknown solutions and observing the formation of a white precipitate, we can confirm the presence of sulfate ions, which is a characteristic of Set C. If the precipitate forms, it indicates that one or multiple solutions in the unknown set contain sulfate ions.
To identify conclusively whether your unknown solutions match Set C, one preliminary test result you can look for is the formation of a white precipitate when you mix the unknown solution with a solution of Ba(NO3)2.
Here's the explanation of how to conduct the test and what the result means:
1. Prepare a small amount of each unknown solution in separate test tubes.
2. Take a fresh test tube and add a few drops of Ba(NO3)2 solution to it.
3. Now, individually mix each unknown solution with the Ba(NO3)2 solution by adding a few drops of the unknown solution to the test tube containing Ba(NO3)2.
4. Observe the test tubes for the formation of any precipitate (solid) when the unknown solution mixes with Ba(NO3)2.
Explanation of the test result:
If a white precipitate forms when any of the unknown solutions mixes with Ba(NO3)2, it indicates the presence of sulfate ions (SO4 2-). This observation is significant because only H2SO4, one of the solutions in Set C, contains sulfate ions. Hence, the formation of a white precipitate would be a preliminary test result suggesting that the unknown solution is likely part of Set C.
Note: It is important to interpret the preliminary test result cautiously and perform confirmatory tests to establish conclusive identification.