Resumen de Chemistry in a Bottle

Thomas S. Kuntzleman, Andrea Matti, Dajena Tomco

• A mixture of salt water and isopropyl alcohol is immiscible, forming two separate liquids with the organic layer on top and aqueous layer on bottom. When universal indicator is added to such a mixture, all of the indicator compounds in the universal indicator preferentially dissolve in the alcohol─except for phenolphthalein at high pH. Mixtures of alcohol, salt water, and universal indicator in a bottle can be made to display a variety of layered color effects within the bottle by adjusting the pH. The various phenomena observed can be tied to an assortment of chemical topics including density, the classification of matter, solubility, intermolecular forces, and acid–base chemistry.