1. There was a reference solution and a blank used in each test so that there is something that can be used for comparison.
2. Some problems associated with the use of qualitative tests are that if you dont wash the mixers correctly, they may contaminate the samples.
3. These tests cannot absolutely confirm the absence of an ion because you may not be able to physically see the ions.
4. Our observations may have changed if we had not cleaned our wells or stirring rods thoroughly after each test in ways that our samples might change color.
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