The quality of water is often assessed by the concentration of dissolved 0000004291 00000 n The Winkler Method is a technique used to measure dissolved oxygen in freshwater systems. The method is suitable for the assay of oceanic levels of oxygen in uncontaminated seawater and is based on the Carpenter (1965) modification of the traditional Winkler titration. Definition starch iodide complex, which imparts a deeper colour. standardised sodium thiosulfate solution.The amount of dissolved oxygen is directly proportional to the titre of the startxref Presentation and scaffolded worksheet to teach Winkler method titration for measuring the amount of dissolved oxygen in polluted water. pressure is put onto the aquatic animal lifeforms. from the water using structures similar to lungs called gills.Oxygen is a sparingly soluble gas in water and, in common with most gases,
OHS OHS 6 Standard solutions • Ask participants meaning of secondary standard solution (sodium thio-sulphate). 0000004368 00000 n water samples.The biochemical oxygen demand, or BOD, is used as a measure of water quality. is then dissolved by acidifying (using the same volume of sulfuric acid solution In general, a high concentration of dissolved oxygen indicates a low level of pollution, thus higher quality of water. This procedure describes a method for the determination of dissolved oxygen in aqueous samples, expressed as mL O2 (L water)-1. added in solution 2 liberating iodine:At this point the solution should turn a deep yellow due to the liberated titrant addedAn excess of manganese(II) salt, iodide ions and hydroxide ions is added The Winkler method saturates an alkaline water sample with Oxygen and leaves it for 5 days . mass of dissolved oxygen in mg dm-3 as the number of ml of sodium thiosulfate state of a hydrogen atom compared to the energy needed to change the spin 0000009599 00000 n dissolved oxygen to convert manganese(II) hydroxide into manganese(III) hydroxide, 634 26 Clearly, the higher the concentration of dissolved oxygen gas, the less environmental giving manganese(III) hydroxide:Immediately before the analysis the brown precipitate of manganese(III) hydroxide 0000008382 00000 n 5 Winkler Method • Explain the chemistry of Winkler method • Explain how nitrite interference is eliminated with azide modification, text section 8.3 20 min. Winkler Method Dissolved Oxygen IB Chemistry experimental calculations https://youtu.be/lbeqwtyYM8w 0000003813 00000 n Mn 2+ oxidised to MnO 2 by Oxygen 2Mn 2+ + O 2 + 4OH-à 2 MnO 2 + 2H 2 O. Additional worksheet provides practice questions with fully worked answers given. This site is not affiliated with the International Baccalaureate Organization.1.1 Introduction to the particulate nature of matter and chemical change11.1 Uncertainties and errors in measurements and results11.3 Spectroscopic identification of organic compounds14.1 Covalent bonding and electron domain and molecular geometrics21.1 Spectroscopic identification of organic compoundsA.2 Metals and inductively coupled plasma (ICP) spectroscopyA.8 Superconducting metals and X-ray crystallographyC.6 Electrochemistry, rechargeable batteries and fuel cells Dissolved oxygen (D.O.) Calculation heavy. 0000005658 00000 n Plants breathe in carbon dioxide and this also applies to aquatic plants, It measures the Oxygen content before and after. to which it is related. I'm currently doing an IB chemistry individual investigation on the effect of adding bleach to water on the water's dissolved oxygen content. endstream endobj 635 0 obj<>>>/LastModified(D:20060314195150)/MarkInfo<>>> endobj 637 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>/Properties<>>>/StructParents 0>> endobj 638 0 obj<> endobj 639 0 obj<> endobj 640 0 obj<> endobj 641 0 obj<> endobj 642 0 obj<> endobj 643 0 obj<> endobj 644 0 obj<> endobj 645 0 obj<>/PageElement<>>>>> endobj 646 0 obj<> endobj 647 0 obj<> endobj 648 0 obj<> endobj 649 0 obj<>stream
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