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2. Hydrochloric acid - Wikipedia

   en.wikipedia.org/wiki/Hydrochloric_acid

   Hydrochloric acid, also known as muriatic acid or spirits of salt, is an aqueous solution of hydrogen chloride (HCl). It is a colorless solution with a distinctive pungent smell. It is classified as a strong acid. It is a component of the gastric acid in the digestive systems of most animal species, including humans.

3. Acidity function - Wikipedia

   en.wikipedia.org/wiki/Acidity_function

   In dilute aqueous solution, the predominant acid species is the hydrated hydrogen ion H 3 O + (or more accurately [H(OH 2) n] +).In this case H 0 and H − are equivalent to pH values determined by the buffer equation or Henderson-Hasselbalch equation.

4. Acid strength - Wikipedia

   en.wikipedia.org/wiki/Acid_strength

   The strength of an inorganic acid is dependent on the oxidation state for the atom to which the proton may be attached. Acid strength is solvent-dependent. For example, hydrogen chloride is a strong acid in aqueous solution, but is a weak acid when dissolved in glacial acetic acid.

5. Hydron (chemistry) - Wikipedia

   en.wikipedia.org/wiki/Hydron_(chemistry)

   In chemistry, the hydron, informally called proton, [2] is the cationic form of atomic hydrogen, represented with the symbol H +The general term "hydron", endorsed by IUPAC, encompasses cations of hydrogen regardless of isotope: thus it refers collectively to protons (1 H +) for the protium isotope, deuterons (2 H + or D +) for the deuterium isotope, and tritons (3 H + or T +) for the tritium ...

6. Aqueous solution - Wikipedia

   en.wikipedia.org/wiki/Aqueous_solution

   An aqueous solution is a solution in which the solvent is water. It is mostly shown in chemical equations by appending (aq) to the relevant chemical formula . For example, a solution of table salt , also known as sodium chloride (NaCl), in water would be represented as Na + (aq) + Cl − (aq) .

7. Perchloric acid - Wikipedia

   en.wikipedia.org/wiki/Perchloric_acid

   Perchloric acid is a mineral acid with the formula H Cl O 4. It is an oxoacid of chlorine . Usually found as an aqueous solution, this colorless compound is a stronger acid than sulfuric acid , nitric acid and hydrochloric acid .