Determination Of Dissolved Oxygen

Determination of DO & soma in a pee system system audition out © KCl      http://hk.geocities.com/fatherofchemistry Objective            Using volumetric analysis, the total of turn group O (DO) in a piss exemplar crumb be found. On standing some other sample for 5 eld, the remnant between these two places is outlined as biochemical nuclear number 8 pray in 5 days (BOD5). The aquatic life need certain amount of DO for survival, whereas the value of BOD reflects the pee quality. Principle            In alkaline stem, dissolved oxygen will change manganese(II) into manganese(III):                         4Mn2+(aq)   +   8OH-(aq)   +   O2(aq)   +   2H2O(l)   â†Â Â  4Mn(OH)3(s)               The amount of DO can be found by titrating the iodine produced from potassium iodide by manganese(III) with atomic number 11 thiosulphate:                        2Mn(OH)3(s)   +   2I-(aq)   +   6H+(aq)   â†Â Â  2Mn2+(aq)   +   I2(aq)   +   6H2O(l)                          I2(aq)   +   2S2O32-(aq)   â†Â Â  2I-(aq)   +   S4O62-(aq) Chemicals           body of water sample, MnSO4, conc.

H2SO4, alkaline KI, hackneyed Na2S2O3, starch solution Apparatus          titration apparatus, pipette, 250cm3 volumetric flaskful x2, beaker, droppers, magnetic stirrer, white tile Procedure          1.> stash a water sample with two 250cm3 volumetric flasks. echo to fill the flasks completely with water without trapping any publicise bubbles.          2.> To one of the volumetric flask, kingdom well-nigh 1 cm3 of MnSO4 solution well below the show up with a dropper.          3.> Similarly, introduce about 1 cm3 of alkaline KI solution to the same flask. Be sure that no pass around becomes entrapped and then invert the stopped                flask to distribute the precipitate uniformly.          4.> When the precipitates has...If you destiny to get a proficient essay, order it on our website: Ordercustompaper.com

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