Here's how to break it down:
* HI: Represents hydrogen iodide, a colorless gas that dissolves readily in water to form hydroiodic acid.
* ·: Indicates a hydrate, meaning water molecules are attached to the main compound.
* 3H₂O: Represents three molecules of water (trihydrate).
Therefore, hydrogen iodide trihydrate is essentially hydrogen iodide with three water molecules attached to each molecule of hydrogen iodide.
