Distilled Water Lab Report

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CHAPTER 3 MATERIALS AND METHOD In this research, the materials will be used are Zn Plate (99.9% purity, Merck), Potassium Hydroxide (Merck), Commercial Zn Plate (Energizer) and diesel oil. Water that will be used is distilled water. 3.1 Preparation of Zinc Plate 3.1.1 Pure Zinc The sample of Zn is taken from the other place. Before proceeding to the next step, the bulk of the Zn will be cut into dimensions 1 cm. After that the sample will be experienced grinding process. The purpose of the grinding process is to remove the passive film that coated at the surface of the Zn. The grinding process of the Zn sample will be ran with various grade of grit paper (180-1200). As the process of grind is complete the next step is polishing the surface of the…show more content…
Where, the volume of water is constant 0.2 L. Distilled water is mixed into the KOH resin until it dissolve. The purpose of using distilled water because the tap water is containing the impurities (minerals, suspended solids and other contaminants). The impurities will precipitate out of the water when subjected to electrolysis. The steps can be summarized as Figure 6. Figure 6 Summarization of preparation KOH solution 3.3 Volumetric Measurement Measurement will be carried out by immersion of Zn (pure and commercial) in the different concentration of KOH (2, 4, 6 and 8 M) and connected a tube to the pipette inside of the beaker that contain water with oil on top of it as shown in Figure 7. The function of the oil is to prevent the water from spill out. Its due to the oil is less dense than the water. This procedure is to calculate and compare between the volume of hydrogen gas that released by the Zn to concentration of KOH. Figure 7 Volumetric Measurement: (a) experiment setup and (b) enlargement of pipette scale 3.4 Physical

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