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Download A Comprehensive Laboratory Manual for Environmental Science by P. R. Sreemahadevan Pillai PDF

By P. R. Sreemahadevan Pillai

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Extra resources for A Comprehensive Laboratory Manual for Environmental Science and Engineering

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Ethylenediamine tetra-acetic acid and its sodium salts (EDTA) form a chelated soluble complex when added to a solution of certain metal cations. 1, the solution will become wine red. If EDTA is then added as a titrant, the calcium and magnesium will be complexed. After sufficient EDTA has been added to complex all the magnesium and calcium, the solution will turn from wine red to blue. This is the end point of the titration. Apparatus 1. Burette 3. Erlenmeyer flask 2. Pipette 4. Bottle etc. 28 A Comprehensive Laboratory Manual for Environmental Science and Engineering Reagents 1.

2. 3. 4. Pipette 50 mL of sample into a clean Erlenmeyer flask (V). Add one drop of sodium thiosulphate solution, if residual chlorine is present. 3, colour of solution becomes pink. Titrate against standard sulphuric acid in the burette, till the colour just disappears. Note down the volume (V1). 5. Then add two drops of methyl orange indicator, the colour turns yellow. 6. Again titrate against acid, until the colour turns to orange yellow. Note down the total volume (V2). 02 N H2SO4 × sample (Methyl orange/phenolphthalein indicator) Description of sample Trial no.

11. Repeat steps 1–10 with higher dose of alum, if necessary. Observation Trial no. Alum dosage in mg/L Results Optimum coagulant dosage = ..........

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