25. Qualitative tests are tests identify the presence or absence of a particular substance. Quantitative tests are tests that determine the amount of a substance in a sample.
26. A confirming test confirms that the ion is either present or absent.
27. The purpose of the reference solution was to be used as a comparison to a solution of known interest, and the purpose of the distilled water blank a solution known not to contain any ions of interest.
28. If a student tests a sample of groundwater for iron and observes no color change, that student should not conclude that no iron was present because sometimes the amount of the substance is so little that it cannot be detected.
29. Give the mixture time to see whether there is a precipitate. If there is a precipitate then the mixture is a suspension. Shining light through the mixture will tell whether it's a colloid or solution.
30. If you do not "shake before using" a bottle when you are instructed to, you will consume clumps of the substance, instead of a uniform mixture throughout.
31. Element symbols should have international acceptance so that it is easier to identify no matter where you are in the world.
32.
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33. Water cannot be completely chemical free because the atmospheric gases nitrogen and oxygen and carbon dioxide will always dissolve in the water to some extent.
34. At room temperature, water is a liquid, whereas hydrogen and oxygen are gases.
#2 Blog question:
1. The purpose of the lab was to learn that if an ion is present, then a confirming reaction will occur in the solution. There were several similarities and differences amongst the different tests, and it was interesting to compare each one. The lab as a whole I thought was difficult at first, because of all of the steps involved, but then after each test the process became easier and easier.
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