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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Question

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)

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