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Senku and the rest decide to make Sulfonamide. Chapter 20 page 10

  1. Electricity
    • Start with Iron
    • Powerful Magnets
    • Copper
    • Phosporus
  2. Chlorosulfuric Acid
    • Salt + Sulfuric Acid = Hydrochloric Acid
    • Salt + Electricity = Sodium Hydroxide
    • Sulfuric Acid + Sodium Hydroxide = Sodium Hydrogen Sulfate
    • Hydrochloric Acid + Sodium Hydrogen Sulfate = Chlorosulfuric Acid
  3. Ammonia
    • Urine
  4. Aniline
    • Coal
  5. Sodium Bicarbonate
    • Alcohol (Carbonation) = Sodium Bicarbonate
  6. Acetic Anhydride
    • Alcohol to Vinegar = Acetic Anhydride

Chrome and Kohaku learns the earth is rotating. Then Senku pointed out the "north star" but according to Kohaku and Chrome (using a magnet), that is not north based on perception. So Senku realized that his trip to Hagone was off since the planet's axis has titled in 5739 years.