Problem 21 - Chemistry Matter and Change

Question

Name the following acids. Assume each compound is dissolved in water. $$\mathrm{HClO}_{2}$$

Step-by-Step Solution

Answer

The acid \( \mathrm{HClO}_{2}\) is named chlorous acid.

Step 1: Introduction to Naming Oxyacids

Oxyacids are acids that contain hydrogen, oxygen, and another element. To name an oxyacid, the name of the polyatomic ion (the base ion) is used, with specific changes to its suffix.

Step 2: Identifying the Polyatomic Ion

For the compound \(\mathrm{HClO}_{2}\), determine the polyatomic ion present. The ion is \(\mathrm{ClO}_{2}^{-}\), which is known as chlorite.

Step 3: Applying the Naming Rules for Oxyacids

When naming the acid form of an ion ending in '-ite', the '-ite' suffix changes to '-ous,' and 'acid' is added at the end. Therefore, the name of \(\mathrm{HClO}_{2}\) is chlorous acid.

Key Concepts

Acid Naming Rules

Naming oxyacids can seem tricky at first, but once you understand the rules, it becomes much easier. Oxyacids are acids that contain hydrogen, oxygen, and another element, typically a non-metal. The key to naming these acids lies in the polyatomic ion from which they are derived. The common rule is to alter the suffix of the polyatomic ion's name, and then add the word 'acid' at the end.

• If the polyatomic ion ends in '-ate,' the suffix changes to '-ic.' For example, \( \text{H}_2\text{SO}_4 \) (which includes sulfate) is sulfuric acid.
• If the polyatomic ion ends in '-ite,' the suffix changes to '-ous.' For example, \( \text{HClO}_2 \) includes chlorite and becomes chlorous acid.

Understanding these rules will help simplify the process of naming any oxyacid.

Polyatomic Ions

Polyatomic ions play a crucial role in chemistry, especially when dealing with oxyacids. A polyatomic ion is a charged species composed of two or more atoms covalently bonded. They act as a single entity when participating in chemical reactions.

Identifying the polyatomic ion within a compound is crucial for naming acids correctly. For example, in \( \text{HClO}_2 \), the polyatomic ion is \( \text{ClO}_2^- \), known as chlorite. You need to recognize these ions and remember their typical names and charges.

Learning common polyatomic ions such as sulfate \( \text{SO}_4^{2-} \), nitrate \( \text{NO}_3^- \), and phosphate \( \text{PO}_4^{3-} \), will help you in identifying them in chemical compounds and naming acids accurately.

Chemistry Education

Chemistry is like learning a new language, and acid naming is one of its many vocabulary lessons. Gaining a solid understanding of these concepts through exercises and practice allows students to decode and understand a wide range of chemical reactions. Educational exercises, like naming acids, offer stepping stones to more complex chemistry topics and help reinforce learning.

To make learning chemistry easier, keep these tips in mind:

• Break down the information into simple, understandable parts.
• Consistently practice naming various compounds to reinforce memory.
• Utilize lots of visual aids such as flashcards or diagrams to help with memorization.

With persistence and the right tools, mastering the topic of chemistry and oxyacids will become a lot more manageable.