Document+7.docx - Project 1 Inorganic Contaminants Present in Water Samples Introduction Background The importance of verifying the identity of an

Document+7.docx - Project 1 Inorganic Contaminants Present...

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Project 1: Inorganic Contaminants Present in Water Samples Introduction Background: The importance of verifying the identity of an unknown substance is critical because it demonstrates the nature of the substance through its chemical properties. The process of confirming an unknown chemical in a substance is a common practice in the real world. This experiment of making the identification of unknown substances in water, can be related to testing groundwater for industrial and agricultural waste products that may contaminate the water distribution system with inorganic chemicals (Tsuchiya, 1). Project 1 experiment allows the students to experience a similar situation by collaborating and using various forms of analysis to recognize chemical properties that are necessary to establish the identity of an unknown substance. Theory: Throughout this experiment, the use of various tests are carried out to help determine the identity of the unknown substance. These tests are known as qualitative and quantitative tests, which involve numbers and counts while qualitative tests do not include numbers in the data. The qualitative tests carried out during this experiment was the flame test and the solubility test, because the results from the tests rely on a description. While the quantitative tests were the pH test and the conductivity test, and gravimetric analysis, which resulted in specific values. The pH test allowed us to determine the acidity of the substance using a pH meter, and the conductivity test helped us determine how conductive the solutions were, and its ability to carry out an electrical charge (Visual Encyclopedia of Chemical Engineering, 1). Gravimetric analysis was also carried out as a quantitative test, which helps determine the substance through the
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measurement of its mass. The flame test was done to determine the color of the flame when dipped in the substance, which reveals the chemical properties of the substance. The solubility test was completed to determine whether the chemicals would dissolve in the given solvent in the experiment (Science Daily, 1). Hypothesis: It was hypothesized based on the results and values from the quantitative and qualitative tests would result in sample A being sodium acetate (CH 3 CO 2 Na) Sample B, Magnesium Sulfate (MgSO 4 ), and Sample E calcium chloride (CaCl 2 ). Through the use of the various lab tests, the qualitative characteristics of the tests would reflect the identity of the chemicals, and the use of gravimetric analysis would later help analyze the unknown contaminant. Methods: Part 1 Methods: To begin the experiment, all necessary materials were gathered together in order to complete all the tests. The first test we completed was the flame test. We first brought the beakers of the unkown substances to the TA, then clean a wire loop with hydrochloric acid (HCl) then again rinse it with distilled water. Then we dipped the wire loop into the unknown sample and placed it
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