Problem 116 - Chemistry An Atoms First Approach

Question

Knowing the names of similar chlorine oxyanions and acids, deduce the names of the following: \(\mathrm{IO}^{-}, \mathrm{IO}_{2}^{-}, \mathrm{IO}_{3}^{-}, \mathrm{IO}_{4}^{-}\) \(\mathrm{HIO}, \mathrm{HIO}_{2}, \mathrm{HIO}_{3}, \mathrm{HIO}_{4}\)

Step-by-Step Solution

Answer

The names of the given iodine oxyanions and acids are: - \(\mathrm{IO}^{-}\): hypoiodite, \(\mathrm{HIO}\): hypoiodous acid - \(\mathrm{IO}_{2}^{-}\): iodite, \(\mathrm{HIO}_{2}\): iodous acid - \(\mathrm{IO}_{3}^{-}\): iodate, \(\mathrm{HIO}_{3}\): iodic acid - \(\mathrm{IO}_{4}^{-}\): periodate, \(\mathrm{HIO}_{4}\): periodic acid

Step 1: Name the iodine oxyanions

We can use the same pattern observed in chlorine oxyanions to determine the names of iodine oxyanions. 1. \(\mathrm{IO}^{-}\): Replace 'chlor' with 'iod' in hypochlorite. The name of this oxyanion is hypoiodite. 2. \(\mathrm{IO}_{2}^{-}\): Replace 'chlor' with 'iod' in chlorite. The name of this oxyanion is iodite. 3. \(\mathrm{IO}_{3}^{-}\): Replace 'chlor' with 'iod' in chlorate. The name of this oxyanion is iodate. 4. \(\mathrm{IO}_{4}^{-}\): Replace 'chlor' with 'iod' in perchlorate. The name of this oxyanion is periodate.

Step 2: Name the iodine acids

Similarly, we can use the pattern observed in chlorine acids to determine the names of iodine acids. 1. \(\mathrm{HIO}\): Replace 'chlor' with 'iod' in hypochlorous acid. The name of this acid is hypoiodous acid. 2. \(\mathrm{HIO}_{2}\): Replace 'chlor' with 'iod' in chlorous acid. The name of this acid is iodous acid. 3. \(\mathrm{HIO}_{3}\): Replace 'chlor' with 'iod' in chloric acid. The name of this acid is iodic acid. 4. \(\mathrm{HIO}_{4}\): Replace 'chlor' with 'iod' in perchloric acid. The name of this acid is periodic acid. In conclusion, the names of the given iodine oxyanions and acids are: - \(\mathrm{IO}^{-}\): hypoiodite, \(\mathrm{HIO}\): hypoiodous acid - \(\mathrm{IO}_{2}^{-}\): iodite, \(\mathrm{HIO}_{2}\): iodous acid - \(\mathrm{IO}_{3}^{-}\): iodate, \(\mathrm{HIO}_{3}\): iodic acid - \(\mathrm{IO}_{4}^{-}\): periodate, \(\mathrm{HIO}_{4}\): periodic acid

Key Concepts

Chemical Nomenclature

In the world of chemistry, calling each substance by a unique and standardized name is vital for clear communication. Chemical nomenclature is the system used for naming chemical compounds. It can seem like a daunting language at first, but it follows specific rules that, once learned, make it possible to name virtually any chemical compound.

Steps to Naming Simple Compounds

• Identify the type of compound (ionic, covalent, acid, etc.).
• Name the cation (positive ion) first and the anion (negative ion) second.
• Use prefixes and suffixes to indicate the presence of multiple atoms or the oxidation states of the elements involved.

As per the exercise, the nomenclature of iodine oxyanions and their corresponding acids is done by substituting the 'chlor' root in chlorine compounds with 'iod', a guideline which is part of a broader set of nomenclature rules.

Inorganic Chemistry

Inorganic chemistry is a branch of chemistry that deals with inorganic compounds, typically those that lack carbon-hydrogen bonds. Such compounds include minerals, metals, and, notably, polyatomic ions. These ions are often found in various salts, and understanding their nomenclature is a fundamental part of inorganic chemistry.

Focus on Oxyanions

Oxyanions, such as the iodine oxyanions given in the exercise, are a common type of polyatomic ions. They consist of an element bonded to one or more oxygen atoms. Recognizing the patterns in their naming is a skill that is particularly important for students of inorganic chemistry because it appears frequently in chemical reactions, analysis, and naming.

Polyatomic Ions

Polyatomic ions are ions consisting of two or more atoms bonded together that carry a net charge. Understanding the structure and composition of polyatomic ions is key to mastering nomenclature and reactivity in chemistry.

Multiple Atoms, One Charge

Even with multiple atoms, these ions behave as a single unit. An oxyanion is a type of polyatomic ion that includes oxygen, like the iodine oxyanions in our exercises. They often form in patterns with their naming depending on the number of oxygens and the oxidation state of the central atom. This pattern recognition can greatly aid in learning the names and formulas of these ions.

Acid Naming

When it comes to naming acids, there's a straightforward set of rules to follow. Acids are typically named based on the anion they form when dissolved in water. For instance, an acid formed from an oxyanion ending in '-ate' will have an acid name with the suffix '-ic'. If the oxyanion ends in '-ite', the acid name will contain the suffix '-ous'.

From Oxyanions to Acids

Just like the iodine oxyanions listed in our exercise transition into hypoiodous acid, iodous acid, iodic acid, and periodic acid. Noticing the suffix change can help students remember that '-ous' is always one less oxygen than '-ic', and prefixes like 'hypo-' and 'per-' indicate the lowest and highest number of oxygen atoms, respectively.