Qualitative Analysis Of Barium Sulfate

2265 Words 9 Pages
Introduction
Unknown substances can be found everywhere. Whether it is the mysterious crust on the desk, or the sticky material found at the bottom of an unwashed bowl, there is a curiosity as to what that substance could be. In science, the unknown substance is called the analyte (1). The unknown substance, taken from the Gulf of Mexico, is tested to determine the true identity of the substance. In order to find the analyte, there are two different scientific methods that can be applied. The first method is called qualitative analysis. Imagine that the unknown substance is a part of the game Clue, in order to find what it could be, observe the specific characteristics that can be used to identify the substance. This could include the color,
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This is a test to see if SO4 is present in the solution. If the mixture has a white precipitate of Barium Sulfate, then the solution has a sulphate ion present (4).
Taking one of the remaining test tubes, add 0.1 mL of BaCl2 into the solution and mix well. HCl Test Fig 5. If HCl is present in the solution, bubbling and a strong smell of ammonium should be present.
Using the remaining test tube, add 0.1 ml of HCl into the solution. Record your findings.
Record Conductivity using Conductivity Meter.

Flame Test
Fig 5. Flame Tests are used to identify the presence of a small number of metal ions in a compounds. The color of the flame is produced by the movement of the electrons in the metal ions found in the compound. (6).
Taking the solution, dip the wire in and soak the tip of the wire.
Place the end of the wire onto an open flame of the bunsen burner, record the findings.
If necessary, repeat any of the previous tests to confirm the solution that is chosen as the correct form.
Safety
Ethanol
Colorless, clear liquid
Causes: eye irritation respiratory tract infection, moderate skin irritation
Flammability:Yes
Molecular weight: 46.0414 g/mole
Boiling Point: 78C
Melting Point: -114.1C
Solubility:
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Using quantitative analysis, the unknown solution can be observed by looking at the color, texture, and pH. Qualitative data, such as the molar mass of the solution can be used to confirm the results taken from the qualitative results. During this experiment, it is concluded that the unknown substance is identified as Calcium Chloride. The basic pH and conductivity found in both solutions helped to confirm it. The flame test also helped in narrowing down the list by showing the presence of calcium found in the solution. Adding silver nitrate confirms that there is a presence of chloride ions also in the solution. This experiment used qualitative and quantitative data to identify the unknown

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