Binary Acid Formula: Examples and Common Compounds

📚 Quick Study Guide

• 🧪 Definition: Binary acids consist of hydrogen and one other element.
• ⚗️ General Formula: $HX$, where X is a halogen (like Cl, Br, I) or sometimes another nonmetal.
• 🌡️ Naming Convention: Hydro- + base name of nonmetal + -ic acid (e.g., Hydrochloric acid).
• ⚛️ Key Examples: Hydrochloric acid (HCl), Hydrobromic acid (HBr), Hydroiodic acid (HI), Hydrosulfuric acid (H₂S).
• 💡 Strength: Acid strength increases down a group in the periodic table for binary acids.
• 📝 Important Note: HF is a weak acid, unlike other hydrohalic acids.

Practice Quiz

1. Which of the following is the correct formula for hydrofluoric acid?
   1. HF
   2. HCl
   3. HBr
   4. HI
2. What two elements are present in all binary acids?
   1. Oxygen and hydrogen
   2. Carbon and hydrogen
   3. Hydrogen and a nonmetal
   4. Nitrogen and hydrogen
3. Which of the following is NOT a binary acid?
   1. HCl
   2. H₂S
   3. HNO₃
   4. HBr
4. What is the name of the acid with the formula HBr?
   1. Bromic acid
   2. Hydrobromic acid
   3. Perbromic acid
   4. Bromous acid
5. Which of the following binary acids is considered a weak acid?
   1. HCl
   2. HBr
   3. HI
   4. HF
6. Which of the following is the correct formula for Hydrosulfuric acid?
   1. HS
   2. H₂S
   3. HSO₄
   4. H₂SO₃
7. As you move down Group 17 (halogens) in the periodic table, the strength of the binary acids generally:
   1. Increases
   2. Decreases
   3. Remains the same
   4. Fluctuates randomly