Definition

Noun: 1. A strong, corrosive acid: Hydriodic acid is a chemical compound, specifically an aqueous solution of the gas hydrogen iodide (HI). It is a powerful acid, meaning it readily donates a proton (H⁺ ion) in water. 2. A reagent in chemistry: It is commonly used in laboratories and industrial processes for various chemical reactions, such as reducing agents or in the synthesis of iodine-containing compounds.

Usage Examples

• Noun:
  • The chemist handled the hydriodic acid with extreme care due to its corrosive nature.
  • In this synthesis, hydriodic acid is used to reduce the organic compound.
  • The concentration of the hydriodic acid solution was precisely measured before the experiment.

Advanced Usage

• Chemical Reduction: Hydriodic acid is frequently employed as a reducing agent in organic chemistry to cleave ethers or reduce certain functional groups.
  • The methoxy group was removed using hydriodic acid in a refluxing apparatus.
• Distinction from Hydrogen Iodide: In precise terminology, "hydrogen iodide" refers to the gaseous HI molecule, while "hydriodic acid" specifically denotes its solution in water.
  • While hydrogen iodide gas is dangerous, hydriodic acid is the form typically handled in solution.

Variants and Related Words

• Hydrogen Iodide (HI): The gaseous molecule that, when dissolved in water, forms hydriodic acid.
• Iodide: The anion (I⁻) present in solutions of hydriodic acid and its salts.
• Hydrohalic Acid: A general term for acids formed from hydrogen and a halogen (e.g., hydrochloric acid, hydrobromic acid, hydriodic acid).

Synonyms

• Hydrogen iodide solution: A more descriptive synonym emphasizing its composition.
• HI(aq): The standard chemical notation, where "(aq)" stands for "aqueous" or dissolved in water.

Related Phrases / Contexts

• Aqueous solution of HI: The most precise descriptive phrase for hydriodic acid.
  • The protocol calls for an aqueous solution of HI at a specific molarity.
• Strong mineral acid: A category that includes hydriodic acid alongside sulfuric, nitric, and hydrochloric acids.
  • Like other strong mineral acids, hydriodic acid requires proper safety equipment.

Noun

1. (HI) a colorless or yellow aqueous solution of hydrogen iodide
   • hydriodic acid is a strong acid