Investigating The Properties Of An Unknown Compound

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Discussion and Scientific Explanation The initial goal of this experiment was to investigate the properties of an unknown acid or base. These properties include pH, concentration, and how the solution behaves once titrated. In order to accomplish these goals, the initial pH of the unknown compound needed to be found through the use of pH strips and/or a PASCO probe. It was also necessary to titrate the unknown compound to find the equivalence point, which would allow the calculation of the initial concentration of the unknown chemicals. In order to see how dilution affected the pH of the unknown compound, it was necessary to dilute the unknown compounds over a series of steps and observe the trend. Finally, it was helpful to test the household chemicals for their acidic or basic properties and compare how they reacted to the reactions of the unknown compounds. The pH of each of the unknown compounds was originally tested through the use of a pH strip, and later with the use of the PASCO pH probe. pH strips determine the hydrogen ion concentration by changing the color of the indicator used, depending on how high or low the concentration is.1 The indicators used on pH strips are usually produced from anthocyanins, which are plant pigments usually responsible for the red and blue pigments in many plants.1 Figure 13: The molecular changes to an indicator when exposed to various pH levels1 pH probes, such as the PASCO probe, also measure only the hydrogen ion concentration
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