1. a) Fe 2+ (FAS) solution is titrated against 2.00 mL of 0.042 potassium dichro

Question

1. a) Fe2+ (FAS) solution is titrated against 2.00 mL of 0.042 potassium dichromate.

Volume of Fe2+ required to reach end point: 2.30 mL.

Find the concentration of Fe2+

b) COD Determination

Volume of sample: 2 mL

Volume of FAS added to COD sample: 1.90 mL

Volume of FAS added to blank: 2.01 mL

Volume of FAS consumed: 2.01 - 1.9 = 0.11 mL

Determine the chemical oxygen demand of COD as mg O2 demanded/ L of sample.

**calcualte using reaction formulas involed NOT the standard formula! Can double check answer with formula if you wish though.**

Explanation / Answer

a) by formula N1V1=N2V2 answer is 901.6 FE2+

b) COD 20 mg o2 demanded/L of sample

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