Commercial heat packs (containing iron and water, or supersaturated sodium acetate) and cold packs (various ammonium salts) can be used to show exo- and endothermicity. Heat packs that contain iron ...

The solution will crystallize as it touches the crystal, resulting in an increasingly tall tower of sodium acetate. Mix 175g of NaOAc trihydrate with 50mL distilled water in a very clean 500mL ...

The sodium and acetate ions are ready to bond with each other and with water molecules to form a crystal. When these ions and molecules attract and bond to each other, energy is released. When alcohol ...