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Determination of nitrogen dioxide content of the atmosphere - Lab Report Example

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The author of this lab report "Determination of nitrogen dioxide content of the atmosphere" comments on the Griess-Saltzman Reaction which determines the nitrogen dioxide content of the atmosphere. Reportedly, an azo dye-forming reagent is used to absorb nitrogen dioxide. …
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Determination of nitrogen dioxide content of the atmosphere
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"Determination of nitrogen dioxide content of the atmosphere"

Download file to see previous pages Apparatus include sampling probe, absorber, gas drying tube, air-metering device, thermometer, manometer, air pump, spectrophotometer, and stopwatch. Reagent grade chemicals have been used. Water free from nitrite and deionized according to specification D 1193 for type I or II reagent water has been used. Anhydrous sulfanilic acid has been used as the absorbing reagent, N-(1-Naphthyl)-Ethylenediamine Dihydrochloride stock solution (0.1 percent), Sodium Nitrite standard solution (0.0246 g/L) and NO2 permeation device were reagents and materials that were used in the experiment. 5.0012 g of anhydrous sulfanilic acid was dissolved in 1 L of water containing 140 mL glacial acetic acid. The process was gently heated to speed up the process. 20 mL of the of N-(1-naphthyl)-ethylenediamine dihydrochloride 0.1 % stock solution and 10 mL acetone were added, and diluted to 1 L. 0.1 g of the reagent was dissolved in 100 mL water.Calibration and StandardizationThe flowmeter was calibrated using practice D 3195. The gas meter was calibrated using test method D 1071. Standardization was based on observation. 0.82 mol of NaNO2 produced the same color as 1 mol NO2. 1 mL working standard solution contains 24.6 µg NaNO2. The amount of NO2 given by (24.6/69.1)x(46.0/0.82), which is 20 µg NO2. Standard conditions of 101 kPa and 25C were taken, and the molar gas volume was 24.47L (ASTM International 3). Graduated amounts of NaNO2 solution were added to a series of 25mL volumetric flasks up to 1 mL. ...Download file to see next pagesRead More
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