You have asked the following question why is iodine called an indicator
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  • Iodine is known as an Indicator Because it changes color in the presence of Starch and several other molecules [1]
  • This is Due to the insolubility of the starch-triiodide complex which may prevent some of the Iodine reacting with the titrant [2]
  • Iodide is therefore an Indicator for excess silver ion in this reaction [6]
  • Upon the addition of more silver the solution becomes turbid Because insoluble silver iodide forms [6]
  • Elmhurst college describes Iodine as a crucial Indicator that is used in several different tests [1]
  • Starch is often used in chemistry as an Indicator for redox titrations where triiodide is present [2]
  • Frostburg's general chemistry online further explains the nature of Iodine as an Indicator of Starch [1]
  • When Iodine and Starch are placed together the mixture takes on an intense blue color [1]
  • Amylose in Starch is responsible for the formation of a deep blue color in the presence of Iodine [3]
  • Why does Iodine turn Starch blue [4]
  • Using Iodine to test for the presence of Starch is a common experiment [4]
  • Education why does Iodine turn Starch blue [4]
  • More research is needed to solve the question whether Iodine requirement depends on such factors as body size body composition and physical activity [5]
  • If Starch amylose is not present then the color will stay orange or yellow [3]
  • Starch - amylose - graphic image in new window shows a very small portion of an amylose chain [3]




More detailed answers below ...


Iodine is


  • Known as an Indicator Because it changes color in the presence of Starch and several other molecules [1]
  • Also frequently used to follow the changes of an iodide ion and iodide element [1]
  • When Iodine Is present with either one a blue-black color will result that does not otherwise occur [1]

Iodine as


  • Elmhurst college describes Iodine As a crucial Indicator that is used in several different tests [1]
  • Frostburg's general chemistry online further explains the nature of Iodine As an Indicator of Starch [1]

Starch is


  • Often used in chemistry as an Indicator for redox titrations where triiodide Is present [2]
  • Amylose in Starch Is responsible for the formation of a deep blue color in the presence of Iodine [3]
  • Using Iodine to test for the presence of Starch Is a common experiment [4]
  • A blue-black color results if Starch Is present [3]
  • A carbohydrate found in plants [4]

Starch coil


  • - chime in new window [3]
  • Or spiral structure [3]

Starch -


  • Amylose - graphic image in new window shows a very small portion of an Amylose chain [3]
  • Amylose - chime in new window [3]

Relevant Images

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why is iodine called an indicatorsource:https://images.reference.com/amg-cms-reference-images/prod/iodine-called-indicator_33e5e26c488f5c8c.jpg

why is iodine called an indicatorsource:https://upload.wikimedia.org/wikipedia/commons/thumb/7/7f/IodineStarch_en.svg/1200px-IodineStarch_en.svg.png




References

  1. https://www.reference.com/science/iodine-called-indicator-33e5e26c488f5c8c
  2. https://en.wikipedia.org/wiki/Iodine_test
  3. http://chemistry.elmhurst.edu/vchembook/548starchiodine.html
  4. https://www.chemistryviews.org/details/education/10128441/Why_Does_Iodine_Turn_Starch_Blue.html
  5. https://www.ncbi.nlm.nih.gov/pubmed/1530280
  6. https://www.britannica.com/science/chemical-indicator
  7. https://www.researchgate.net/post/What_information_can_we_get_by_applying_Iodine_vapors_to_the_TLC_plate_of_a_plant_extract

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