Azide-winkler Titration
Azide-winkler Titration - Related Videos
10:17
Introduction to Titration
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2023
Source: Laboratory of Dr. Yee Nee Tan — Agency for Science, Technology, and Research Titration is a common technique used to quantitatively determine the unknown concentration of an identified analyte.1-4 It is also called volumetric analysis, as the measurement of volumes is critical in titration. There are many types of titrations based on the types of reactions they exploit. The most common types are acid-base titrations and redox titrations.5-11 In a typical titration process, a standard...
06:58
n-Butyllithium Titration
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2023
Source: Vy M. Dong and Diane Le, Department of Chemistry, University of California, Irvine, CA This experiment will demonstrate a simple technique to titrate and obtain an accurate concentration of the organolithium reagent, n-butyllithium (n-BuLi). Organolithium reagents are extremely air- and moisture-sensitive and proper care must be taken to maintain the quality of the reagent so that it may be used successfully in a reaction. The n-BuLi titration experiments should be performed regularly...
02:08
Titration of a Polyprotic Acid
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2020
A polyprotic acid contains more than one ionizable hydrogen and undergoes a stepwise ionization process. If the acid dissociation constants of the ionizable protons differ sufficiently from each other, then the titration curve for such polyprotic acid generates a distinct equivalence point for each of its ionizable hydrogens. Therefore, titration of a diprotic acid results in the formation of two equivalence points, whereas the titration of a triprotic acid results in the formation of three...
02:23
Acid-Base Titration Curves
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2020
A titration curve is a plot of some solution property versus the amount of added titrant. For acid-base titrations, solution pH is a useful property to monitor because it varies predictably with the solution composition and, therefore, may be used to monitor the titration’s progress and detect its endpoint. Acid-base titration can be performed with a strong acid and a strong base, a strong acid and a weak base, or a strong base and a weak acid. For a titration carried out for 25.00 mL of 0.100...
07:23
An Optimized Protocol for the Efficient Radiolabeling of Gold Nanoparticles by Using a 125I-labeled Azide Prosthetic Group
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Cited by 5 •
2016
A detailed procedure for the synthesis of a 125I-labeled azide and the radiolabeling of dibenzocyclooctyne (DBCO)-group-conjugated, 13-nm-sized gold nanoparticles using a copper-free click reaction is described.
FAQs
The alkaline stage is essential because it allows manganese(II) hydroxide to react with oxygen dissolved in the sample and form an oxidized manganese compound. This reaction converts oxygen into a measurable chemical signal that can be processed after the sample is acidified. The resulting iodine amount ultimately reflects the original dissolved oxygen concentration.
Acidification enables the oxidized manganese compound to oxidize iodide, producing iodine in an amount proportional to the dissolved oxygen originally present. This step is important because it converts the oxygen-dependent manganese reaction into iodine, a species that can be measured through titration. The iodine therefore acts as the immediate chemical signal carried into the final analytical step.
Standardized sodium thiosulfate is used to titrate the iodine released during the reaction sequence. Starch identifies the endpoint, allowing the analyst to recognize when the titration is complete. The amount of thiosulfate required at that endpoint is then used to calculate dissolved oxygen concentration, so endpoint detection and reagent standardization directly affect the analytical result.
An analysis proceeds by treating the water sample under alkaline conditions with manganese(II) hydroxide, allowing dissolved oxygen to produce the oxidized manganese compound. Acidification then enables iodide oxidation to iodine, which is titrated with standardized sodium thiosulfate until the starch endpoint is reached. This sequence connects the measured titrant amount with dissolved oxygen.
Azide-Winkler titration can be applied to rivers, lakes, and wastewater, where dissolved oxygen measurements help evaluate water quality and treatment performance. Environmental scientists also use the results in aquatic ecosystem studies and pollution monitoring. Because the same oxygen-related measurement supports several settings, the technique links laboratory analysis with assessments of environmental condition.
Within biological oxygen demand studies, the dissolved oxygen measurement serves as the analytical basis for assessing oxygen demand. Applying the method to relevant water samples helps environmental scientists evaluate pollution conditions and wastewater treatment, while also supporting aquatic ecosystem studies. Its value comes from translating the chemical signal into an indicator used across water-quality investigations.