By Patryk, Karolina, and Hailey.
About a month ago, my group and I was assigned to research and perform it on video. Our project is called the Pretty Pink Disappearing Ink project and we are using acids, bases and indicators to change a shirt stain form clear to pink and back.
https://youtu.be/WMflgXIyV90
Lab Report
Research: The three of us researched cool Science experiments that we could record and perform from YouTube and the Internet. We found a cool experiments involving fire and burning but ultimately Karolina found an experiment where we could use acids and bases to reveal indicators on a cloth surface. Here is the Video we got inspiration from (https://www.youtube.com/watch?v=_aY7G8Z0A0s).
Procedure: Hailey and Patryk are alone while their parents are out of the house. The two are bored and so they decide to use their experiment kit that received from their Uncle and test it out on a white shirt. The chemicals inside of the kit are Phenolphthalein (and indicator that is colorless at first but turns pink in a Base with a pH of 8.5), Sodium Hydroxide (Solution with a pH of 13) and 100% Ethyl rubbing alcohol (Solution with a pH of 5.5). The Phenolphthalein is first added into the white shirt just by adding a few drops of it. Next, we add sodium hydroxide to it and because it has a high enough pH, it turns the phenolphthalein pink. Following that, we convert the Phenolphthalein back to colorless by adding the alcohol. Originally we were going to do this experiment with a doll to change her hair pink, however we were unable to obtain a doll at the time so we improvised and decided to use a shirt instead.
Chemical Reaction:
Sodium hydroxide (NaOH) and carbon dioxide (CO2) reacts to produce sodium carbonate (Na2CO3) and water (H2O) in a process called neutralization. The acidity of the alcohol takes over the neutralized sodium carbonate and water and changes the indicator pink.
Materials:
- Safety Goggles
- 10 drops of Phenolphthalein
- 70% Ethyl rubbing alcohol
- Sodium Hydroxide
- 50ml beaker
- White shirt
Outcome:
The experiment worked. The Phenolphthalein turned pink when in contact with the Sodium Hydroxide and was really nice and bright. The Phenolphtalein did turn colorless again when adding the Ethyl alcohol however it did take a little longer than expected, maybe because of the concentration of the alcohol. No one got injured or was in any harm from this experiment and it all worked out well.
Conclusion: This project is magic because the ink can appear and disappears when it combines with an acidic or base solution. Because the watcher doesn’t know what will happen until the video is explained, they just see that we made the color pink from adding of a few liquids to a white shirt and then changing it back to colorless.