1. acid 2. base 3. indicator 4. ion 5. litmus 6. neutral 7. phenolphthalein

-having no preference or tendency to move one way or the other; neither acid nor base

-a white powder used in testing acids and bases

-a chemical species that releases hydroxide ions

-a substance used to show a change in chemical conditions

-a charged atom or group of atoms

-a compound that yields hydronium ions in water

-a blue coloring matter obtained from certain plants ​