25. Qualitative tests are tests that identify the presence or absence of a particular substance in a sample. Quantitate tests determine the amount of a specific substance present in a sample.
26. A confirming test is a positive test that confirms that the ion in question in present.
27.
a) We used a reference solution because a reference solution is a solution of known composition used as a comparison. It is knows to contain the sought ion.
b)We used a distilled water-blank because it is known not to contain any ions of interest
28. Yes that means that the iron is present because the test was positive.
29. I would do the Tyndall effect and pass a light through the water.
30. Because medicine is a colloid, it is not uniform and you might only drink some of the minerals or solutes so you need to shake it to drink all the required things in the medicine.
31. It is useful for element symbols to have international acceptance because that way it can be read by anyone and there is never any confusion.
32.
33. It is not possible for water to be 100% chemical free because atmosphere gasses will always dissolve in water to some extent.
34. H20 is a liquid made up of gasses because Oxygen and Hydrogen are gasses and together they make a liquid at room temperature.
Lab Questions #1-4
1. The reference solution and a blank were used to compare results.
2. The problems with qualitative tests are that you can see the presence, but not the amount.
3. If the ions are are in very small amounts, then the chemical test involved is unable to produce a confirming result.
4. If the wells are contaminated, there are bad results.
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