In Chemistry class the other day we decided to make disapearing ink. The first step was to measure out 0.1 grams of phenolphthalein into a flask then we added 10 mL of ethanol and mixed it up so it could dissolve. Then we added 100 mL of water and it turned into a milky white color and then we added 3 drops of sodium hydroxide and the entire thing turned dark red. The ethanol is there to help in the distillation of the water. As the the ink is exposed is to carbon and the air the pH level drops because of the hydrogen ions that were made in the mixture, that makes the ink turn from red to clear.
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December 2016
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