NOMENCLATURA DE ÁCIDOS. OXACIDOS

Introduction to Inorganic Nomenclature

Overview of Acids and Their Properties

• The lesson begins with a warm welcome to students, emphasizing the ease of learning inorganic nomenclature in chemistry.

• Focus is on oxyacids, which are characterized by containing hydrogen, a non-metallic element, and oxygen. Examples include hypochlorous acid and sulfuric acid.

• Oxyacids are formed through the combination of acidic oxides with water; this process is crucial for understanding their formation.

Characteristics of Acids

• Acids share properties with hydroxides; they have a sour taste (like lemons), can be corrosive to metals and living tissues, and turn pH indicators red.

• They neutralize bases, highlighting their reactive nature in chemical processes.

Nomenclature of Oxyacids

Naming Conventions

• The discussion shifts to how acids are named based on their composition and oxidation states of non-metallic elements like chlorine.

• Chlorine can form multiple acids due to its various oxidation states; thus, different nomenclatures (systematic and traditional) are used for naming these acids.

Oxidation States Importance

• Understanding oxidation states is essential as the name depends on these values. For example, hydrogen has an oxidation state of +1 while oxygen typically has -2.

• The balance between positive and negative charges must be maintained when determining the correct formula for oxyacids.

Application of Nomenclature Rules

Systematic Naming Methodology

• In systematic nomenclature (IUPAC), the name includes "acid," followed by the central element's name (e.g., chloric acid), along with its oxidation state in Roman numerals.

• For instance, if chlorine has an oxidation state of +1, it would be named "chlorous acid" using this method.

Traditional Naming Approach

• The traditional nomenclature involves using root names from elements combined with specific suffixes based on their oxidation states:

• "-ous" for lower states,

• "-ic" for higher states,

• Prefixes like "hypo-" or "per-" may also be used depending on the number of oxygen atoms present.

Summary Example Names

Nomenclature of Acids and Oxidation States

Understanding Chlorine Compounds

• The discussion begins with the nomenclature of chlorine compounds, specifically focusing on the classical naming system. The term "ácido cloroso" is introduced based on oxidation states.

• The speaker explains that the oxidation number for chlorine leads to its classification as "oso" or "ico," depending on whether it has a lower or higher oxidation state. This is crucial for proper naming conventions.

Naming Boron Compounds

• Transitioning to boron, the speaker outlines how to name acids derived from boron using classical nomenclature, emphasizing that boron only has one oxidation state available for use in naming. Thus, it results in "ácido bórico."

• The importance of understanding oxidation states is reiterated, particularly how they influence the naming process when dealing with elements like boron which have limited states.

Sulfur Compound Nomenclature

• Moving onto sulfur compounds, the speaker discusses how to determine names based on their oxidation states (4 and 6). For example, "ácido sulfúrico" corresponds to a higher state while "ácido sulfuroso" relates to a lower state. This distinction is vital in chemical nomenclature.

• A specific focus is placed on sulfur's unique root ("sulfuro") and how this affects its naming convention within classical nomenclature systems. It highlights that not all elements can utilize every possible oxidation state for naming purposes.

Application of Nomenclature Rules

• In practical application, when given a compound name such as “ácido bromíco,” it indicates the presence of hydrogen and oxygen alongside bromine; thus requiring an understanding of their respective oxidation states for accurate formula derivation.