Question

In a COD experiment, initially there are 300 mg/L of potassium dichromate (K2Cr2O7) in a 5 mL sulfuric acid solution. 1 mL of a wastewater sample is added. At the end of the digestion, the concentration of produced chromium oxide (Cr2O3) is 100 mg/L. What is the COD of the wastewater sample?

Name: in a cod experiment initially there are 300 mgl of potassium dichromate k2cr2o7 in a 5 ml sulfuric acid solution 1 ml of a wastewater sample is added at the end of the digestion the concentr 21006
Uploaded: 2022-07-09T07:01:14-08:00
Duration: 4 min 13 s
Channel: Adi S
Description: in a cod experiment initially there are 300 mgl of potassium dichromate k2cr2o7 in a 5 ml sulfuric acid solution 1 ml of a wastewater sample is added at the end of the digestion the concentr 21006

          In a COD experiment, initially there are 300 mg/L of potassium dichromate (K2Cr2O7) in a 5 mL sulfuric acid solution. 1 mL of a wastewater sample is added. At the end of the digestion, the concentration of produced chromium oxide (Cr2O3) is 100 mg/L. What is the COD of the wastewater sample?

Added by Scott A.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Adi S

07/09/2022

Step 1

To do this, we can use the formula: moles = (concentration in mg/L) * (volume in L) / (molar mass) moles = (300 mg/L) * (5 mL / 1000) / (294.18 g/mol) moles = 0.0051 mol Show more…

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In a COD experiment, initially there are 300 mg/L of potassium dichromate (K2Cr2O7) in a 5 mL sulfuric acid solution. 1 mL of a wastewater sample is added. At the end of the digestion, the concentration of produced chromium oxide (Cr2O3) is 100 mg/L. What is the COD of the wastewater sample?