Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

5. Classification & Balancing of Chemical Reactions

Solubility Rules

GOB Chemistry

5. Classification & Balancing of Chemical Reactions

Solubility Rules

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0:42 minutes

Problem 31d

Textbook Question

Predict whether each of the following ionic compounds is soluble in water:
d. K₂O

Verified step by step guidance

Identify the ions that make up the compound K₂O. Potassium (K⁺) is a Group 1 metal, and oxygen (O²⁻) is the anion.

Recall the solubility rules for ionic compounds. One key rule is that all compounds containing Group 1 metal cations (such as K⁺) are soluble in water.

Apply the solubility rule to K₂O. Since it contains the Group 1 metal potassium (K⁺), the compound is expected to be soluble in water.

Consider any exceptions to the solubility rules. In this case, there are no exceptions that apply to K₂O, so the compound remains soluble.

Conclude that K₂O is soluble in water based on the solubility rules and the absence of exceptions.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Ionic Compounds

Ionic compounds are formed when atoms transfer electrons, resulting in the formation of positively and negatively charged ions. These compounds typically consist of a metal and a non-metal, and their properties include high melting and boiling points, as well as electrical conductivity when dissolved in water.

Solubility Rules

Solubility rules are guidelines that help predict whether an ionic compound will dissolve in water. Common rules include that most alkali metal compounds and nitrates are soluble, while many carbonates and phosphates are not. Understanding these rules is essential for determining the solubility of specific compounds.

Potassium Oxide (K₂O)

Potassium oxide (K₂O) is an ionic compound formed from potassium ions (K⁺) and oxide ions (O²⁻). According to solubility rules, compounds containing alkali metals, such as potassium, are generally soluble in water. Therefore, K₂O is expected to react with water to form potassium hydroxide (KOH), which is soluble.

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Predict whether each of the following ionic compounds is soluble in water: d. K2O

Key Concepts

Ionic Compounds

Solubility Rules

Potassium Oxide (K₂O)

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Predict whether each of the following ionic compounds is soluble in water:
d. K₂O