Definition

1. Noun:
   • A specific inorganic chemical compound: Manganic acid is a dibasic acid with the formula H₂MnO₄. It is unstable and is not found as a pure substance, existing only in aqueous solution or as part of manganate salts.

Usage and Examples

• Noun:
  • The formation of manganic acid is a key intermediate step in certain redox reactions.
  • Potassium manganate contains the anion derived from manganic acid.

Advanced Usage and Notes

• Chemical Context: The term "manganic acid" is primarily used in inorganic chemistry to describe the hypothetical acid H₂MnO₄, from which manganate salts (containing the MnO₄²⁻ ion) are derived. It is contrasted with permanganic acid (HMnO₄).
• Instability: It is consistently noted that manganic acid itself is unstable and cannot be isolated, only detected in solution.

Variants and Related Words

• Manganate (noun): A salt containing the MnO₄²⁻ anion, which is the conjugate base of manganic acid.
  • Sodium manganate is a green compound.
• Permanganic acid (noun): A related but stronger acid with the formula HMnO₄.

Synonyms

• H₂MnO₄: The chemical formula serves as a precise synonym in scientific contexts.

Related Chemical Terms

• Dibasic acid: An acid containing two replaceable hydrogen atoms per molecule, a category which includes manganic acid.
• Manganate ion: The MnO₄²⁻ ion, which is central to compounds related to manganic acid.

Noun

1. a dibasic acid (H2MnO4) found only in solution and in manganate salts