Homework Blog 7

1SBS 52 #25-34 

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's known to not contain any ions of interest.

28. Yes, which 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 to test if there the mixture is a suspension, solution or a colloid. 

      

30. Medicine is a colloid; therefore, it is not uniform and it's possible that you might only drink some of the minerals or solutes. So, must shake the bottle in order to mix everything together.

31. It's useful for element symbols to have international acceptance because this way no one can get confused and it can be read by anyone. 

32.

 

33. It isn't possible for water to be 100% chemical free because atmosphere gasses will always dissolve in water to some extent.

34. H20 is water which is a liquid that is made up of gasses, oxygen and hydrogen. Together they make a liquid at room temperature.