Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Starch_indicator> ?p ?o. }
Showing items 1 to 34 of
34
with 100 items per page.
- 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.To prepare starch indicator solution, add 1 gram of starch (either corn or potato) into 10 mL of distilled water, shake well, and pour into 100 mL of boiling, distilled water. Stir thoroughly and boil for a 1 minute. Leave to cool down. If the precipitate forms, decant the supernatant and use as the indicator solution. To make solution long lasting add a pinch of mercury iodide or salicylic acid, otherwise it can spoil after a few days.".
- Starch_indicator wikiPageExternalLink starch-as-redox-indicator.shtml.
- Starch_indicator wikiPageExternalLink iodometric-titration-solutions.
- Starch_indicator wikiPageID "10494073".
- Starch_indicator wikiPageRevisionID "598046754".
- Starch_indicator hasPhotoCollection Starch_indicator.
- Starch_indicator subject Category:Chemical_tests.
- Starch_indicator subject Category:Laboratory_techniques.
- Starch_indicator type Ability105616246.
- Starch_indicator type Abstraction100002137.
- Starch_indicator type ChemicalTests.
- Starch_indicator type Cognition100023271.
- Starch_indicator type Experiment105798043.
- Starch_indicator type HigherCognitiveProcess105770664.
- Starch_indicator type Inquiry105797597.
- Starch_indicator type Know-how105616786.
- Starch_indicator type LaboratoryTechniques.
- Starch_indicator type Method105660268.
- Starch_indicator type ProblemSolving105796750.
- Starch_indicator type Process105701363.
- Starch_indicator type PsychologicalFeature100023100.
- Starch_indicator type Technique105665146.
- Starch_indicator type Thinking105770926.
- Starch_indicator type Trial105799212.
- 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 "Salda d'amido".
- Starch_indicator label "Starch indicator".
- Starch_indicator sameAs Salda_d'amido.
- Starch_indicator sameAs m.02qfs4l.
- Starch_indicator sameAs Q3945377.
- Starch_indicator sameAs Q3945377.
- Starch_indicator sameAs Starch_indicator.
- Starch_indicator wasDerivedFrom Starch_indicator?oldid=598046754.
- Starch_indicator isPrimaryTopicOf Starch_indicator.