Chemistry Solved_Part_33

Chemistry Solved_Part_33 - 2010 Digital Interactive Video...

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Unformatted text preview: 2010 Digital Interactive Video Education Week 19 98 Methods Equipment: digital balance, weighing dish, LaMotte SMART Spectrophotometer, 25 mm round cuvettes (8), 50, 100, 500, and 1000 mL volumetric fasks, 10 mL graduated cylinder, saFety glasses. Chemicals: Potassium Nitrate (KNO 3 ), LaMotte Mixed Acid Reagent V-6278-L, LaMotte Nitrate Reducing Reagent V-2279-G, distilled water. Procedure: ReFer to video lab. Record your data below. Concentration (M) Absorbance 0.0 0.0 6.25 12.5 25 50 100 Unk. 1-tap water Unk. 2-pond water Results: Make a graph oF concentration vs. absorbance below, or in MicrosoFt Excel (preFerred), and determine R 2 and the linear equation (set y-intercept to 0): 0.1 0.2 0.3 0.4 0.5 110 90 70 50 30 10 absorbance Concentration (M) 2010 Digital Interactive Video Education Discussion: 1. Was your hypothesis correct? Find % error. 2. List at least three sources of error....
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Chemistry Solved_Part_33 - 2010 Digital Interactive Video...

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