Chemical Concept Demonstrated: Acid-base chemistry
Part B (not shown in video). Six different glasses are obtained.
Part A: The second and fourth glasses turned red. When the contents are poured back into the pitcher the solution turns colorless. The contents in the milk bottle turn a milky white.
Part B: Each of the glasses turns a different color: red, white, blue, black, green, and amber.
Part A: The "water" is made up of water, phenolphthalein, and a small amount of dilute acid. (Phenolphthalein changes from colorless to red in the presence of a strong base.) Before the pouring the "water," the first glass contained H2SO4. The second and fourth glasses contained NaOH. The third and fifth glasses contained water. The milk jug contained a saturated solution of SbCl3 in HCl.
Part B: The "water" is made up of water and ferric ammonium sulfate. The glasses contained KSCN, BaCl2, K4Fe(CN)6, tannic acid, tartaric acid, NaHSO3.