iynt 2015 problem n6 " disappearing ink" reporter: nino kimadze team: georgians
TRANSCRIPT
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IYNT 2015PROBLEM N6 "Disappearing ink"Reporter: Nino Kimadze
Team: Georgians
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Task conditionSuggest a chemical formulation for the ink that would disappear after used to write a text. What parameters
determine the time when the text becomes invisible? Is it possible to process the paper in such a manner that the text
appears again?
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PlanExplanation of phenomenon RecipesThe firstThe second The third
Testing the inkChemical reactionsImportant parametersTheoretical resultsExperimentComparison
Conclusion
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Begin the ink preparation
ammonium hydroxide
phenolphthalein
The first ink
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1) NaOH2) Distilled Water
1)Alcohol ; 2) Distilled water3)Thymolphthalein
The second ink
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The third ink
1) Cobalt chloride 2) Iodine
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Chemical reactions
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CO2 + H2O → H2CO3
pH is 11.63, then decreases to 7.
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Time of ink dissapearance
C - concentrationT - temperatureS - areaP - pressure
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Y ( time )X (C - ammonium hydroxide)
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Y ( time)X (C - phenolphthalein )
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Y ( time)X ( S - area )
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T
C (thymol)
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T
C(naoh)
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Conclusion
Three dissapearing inks
How these inks became visible
Parameters
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Thanks your attention
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Explanation chemical reactions and their resilts
1) Phenolphthalein is synthesized by condensation of phthalic anhydride with two equivalents of phenolunder under acidic
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Upon heating, the hexahydrate dehydrates in a stepwise manner.[5] An aqueous solution of CoCl2 on addition of excess of concentrated HCl gives [CoCl4]2- which is detected by blue coloration.
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Materials Used
PhenolphthaleinThymolphthalein Sodium hydroxide Alcohol Distilled water Ammonium hydroxide Brush PaperCotton Cobalt chlorideIodine
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Begin the ink preparation
The first ink
1) Let's pour 6 ml ammonium hydroxide in a test-tube and add 1 drop phenol-phthalein and mix them the mixture willget pink colour.
2) If we want the mixture to be blunt wecan add glycerin , but glycerin none - evaparated substance as well is needmuch time to dry..
The second ink
1) Let's pour 0.05 ml thymolphtalein, add5ml alcohol and 50ml distilled water.Thisis mixture I
2) Put two tea spoons sodium hydroxide into the test-tube, add 100ml distilled water mix them. Call this mixture - II
3) Pour some drops from the mixture IIto the mixture I and mix them until it gets its colour
Pour iodine into the best-tube and add cobalt chloride
The third ink
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Cobalt chloride consists of the molecule of CoCl2 and 6 molecules of crystallized water. After heating the crystallized water is lost, and pure Cobalt chloride appears in bright blue color.
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Ammonium hydroxide is received by mixindammonium and water
NH3 + H2O ⇄ NH4(OH)