A potassium hydrogen phthalate solution was prepared by adding 0.0996 g of dry potassium hydrogen phthalate (MW = 204.22) in 100 mL distilled water. 1 mL of the prepared potassium hydrogen phthalate solution was transferred using pipette into 500-10000 mg/L COD tube before digested in the thermo-reactor at 148 oC for two hours. Calculate the measured COD reading in mg 02/L from the spectrophotometer at 600 nm if given oxygen molecular weight is 32 and the chemical equation for the oxidation reaction between potassium hydrogen phthalate (C8H5KO4) and chromic acid in the COD reagent tube is as follows: C8H5KO4 + 15/202 + H+ →→ 8C02 +K+ + 3H2O. (Note: MW is molecular weight)

A potassium hydrogen phthalate solution was prepared by adding 0.0996 g of dry potassium hydrogen phthalate (MW = 204.22) in 100 mL distilled water. 1 mL of the prepared potassium hydrogen phthalate solution was transferred using pipette into 500-10000 mg/L COD tube before digested in the thermo-reactor at 148 oC for two hours. Calculate the measured COD reading in mg 02/L from the spectrophotometer at 600 nm if given oxygen molecular weight is 32 and the chemical equation for the oxidation reaction between potassium hydrogen phthalate (C8H5KO4) and chromic acid in the COD reagent tube is as follows: C8H5KO4 + 15/202 + H+ →→ 8C02 +K+ + 3H2O. (Note: MW is molecular weight)

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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A fermenter was filled with 10L of 0.6 mol/L sodium sulfite solution containing 0.003M Cu2+ ion and the air sparger was turned on. After exactly 10 minutes, the airflow was stopped and a 5 mL sample was taken and titrated. The concentration of sodium sulfite in the sample was found to be 0.2 M. Calculate the oxygen uptake rate.
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A unique plant was discovered from the hot springs of Maquinit, Coron, Palawan. To study the activity of the plant, approximately 5.00 g of the fresh plant was finely cut and ground and then mixed with an extraction buffer to make up a total of 1.00 mL crude plant extract. Approximately 19.00 mL of water was added to the plant extract. To determine the protein concentration of the extract, a bovine serum albumin (BSA) stock solution with a concentration of 200 µg mL-1 was used and mixtures with the following compositions and absorbance readings were prepared: Tube # |Volume of BSA, mL |Volume of water, mL Absorbance |0.00 2.00 |0.000 2 |0.40 |1.60 0.094 3 |0.80 |1.20 |0.175 4 |1.20 |0.80 |0.282 |1.60 |0.40 |0.342 |2.00 |0.00 0.450 A 200 µL aliquot of the diluted plant extract was added with 300 µL water and was subjected to Bradford assay. Determine the protein concentration, in mg mL-1, of the original 1.00 mL crude extract if the absorbance acquired from the analysis is 0.200.
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