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There are four tubes contains NaOH, Ba(NO3)2, MgSO4, ZnSO4. but they are unlabled. so we don't know which tube contains which chemical. we have to indicate each chemical. we can't use heat or other chemicals. how to do this
Accepted Answer
You can identify the solutions using these steps:
1. Visual Observation: Carefully observe the solutions for any obvious differences. For example, if one solution is cloudy or has a precipitate, it could be Ba(NO3)2 (as BaSO4 is insoluble). However, this is not always reliable.
2. Conductivity: Use a conductivity probe or apparatus. Strong electrolytes like NaOH, Ba(NO3)2, MgSO4, and ZnSO4 will conduct electricity well. Compare the conductivity of the solutions. NaOH will likely have the highest conductivity due to its strong ionic nature.
3. pH Testing: Use pH paper or a pH meter. NaOH will be strongly basic (high pH), while the other solutions will be closer to neutral.
4. Precipitation Reactions: If you have access to a few common reagents (like dilute solutions of Na2SO4, BaCl2, and MgCl2), you can perform selective precipitation tests. For example, adding Na2SO4 to the tubes will precipitate BaSO4 from the Ba(NO3)2 solution and MgSO4 from the MgSO4 solution, leaving ZnSO4 in solution.
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