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- Starch_indicator abstract "Starch is often used in chemistry as an indicator for redox titrations where triiodide is present. Starch forms a very dark blue-black complex with triiodide which can be made by mixing iodine with iodide (often from potassium iodide). However, the complex is not formed if only iodine or only iodide (I−) is present. The colour of the starch complex is so deep, that it can be detected visually when the concentration of the iodine is as low as 0.00002 M at 20 °C. The colour sensitivity decreases with increasing temperature (ten times less sensitive at 50 °C), and upon the addition of organic solvents such as ethanol or propanone. During iodine titrations, concentrated iodine solutions must be reacted with some titrant, often thiosulfate, in order to remove most of the iodine before the starch is added. This is due to the insolubility of the starch-iodine complex which may prevent some of the iodine reacting with the titrant. Close to the end-point, the starch is added, and the titration process is resumed taking into account the amount of thiosulfate added before adding the starch.".
- Starch_indicator wikiPageExternalLink starch-as-redox-indicator.shtml.
- Starch_indicator wikiPageExternalLink iodometric-titration-solutions.
- Starch_indicator wikiPageID "10494073".
- Starch_indicator wikiPageLength "1810".
- Starch_indicator wikiPageOutDegree "13".
- Starch_indicator wikiPageRevisionID "698023606".
- Starch_indicator wikiPageWikiLink Black.
- Starch_indicator wikiPageWikiLink Blue.
- Starch_indicator wikiPageWikiLink Category:Chemical_tests.
- Starch_indicator wikiPageWikiLink Category:Laboratory_techniques.
- Starch_indicator wikiPageWikiLink Coordination_complex.
- Starch_indicator wikiPageWikiLink Iodine_test.
- Starch_indicator wikiPageWikiLink Iodometry.
- Starch_indicator wikiPageWikiLink Potassium_iodide.
- Starch_indicator wikiPageWikiLink Redox_indicator.
- Starch_indicator wikiPageWikiLink Redox_titration.
- Starch_indicator wikiPageWikiLink Starch.
- Starch_indicator wikiPageWikiLink Thiosulfate.
- Starch_indicator wikiPageWikiLink Triiodide.
- Starch_indicator wikiPageWikiLinkText ""iodine-starch complex"".
- Starch_indicator wikiPageWikiLinkText "Starch indicator".
- Starch_indicator wikiPageWikiLinkText "starch as an indicator".
- Starch_indicator wikiPageWikiLinkText "starch indicator".
- Starch_indicator wikiPageWikiLinkText "starch solution".
- Starch_indicator wikiPageUsesTemplate Template:Chemistry-stub.
- Starch_indicator wikiPageUsesTemplate Template:Cn.
- Starch_indicator wikiPageUsesTemplate Template:Merge.
- Starch_indicator wikiPageUsesTemplate Template:Unreferenced.
- Starch_indicator subject Category:Chemical_tests.
- Starch_indicator subject Category:Laboratory_techniques.
- Starch_indicator type Laboratory.
- Starch_indicator type Technique.
- Starch_indicator comment "Starch is often used in chemistry as an indicator for redox titrations where triiodide is present. Starch forms a very dark blue-black complex with triiodide which can be made by mixing iodine with iodide (often from potassium iodide). However, the complex is not formed if only iodine or only iodide (I−) is present. The colour of the starch complex is so deep, that it can be detected visually when the concentration of the iodine is as low as 0.00002 M at 20 °C.".
- Starch_indicator label "Starch indicator".
- Starch_indicator sameAs Q3945377.
- Starch_indicator sameAs Empois.
- Starch_indicator sameAs Salda_damido.
- Starch_indicator sameAs m.02qfs4l.
- Starch_indicator sameAs Q3945377.
- Starch_indicator wasDerivedFrom Starch_indicator?oldid=698023606.
- Starch_indicator isPrimaryTopicOf Starch_indicator.