Multiple Choice
What type of force attracts cations and anions to each other?
2. Atoms & Elements
Ions
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When water molecules undergo auto-ionization, which ions are released?
A
Hydrogen ions (H+) and hydroxide ions (OH-)
B
Ammonium ions (NH4+) and nitrate ions (NO3-)
C
Sodium ions (Na+) and chloride ions (Cl-)
D
Calcium ions (Ca2+) and carbonate ions (CO3^2-)
Verified step by step guidance1
Understand the concept of auto-ionization of water: Water molecules can spontaneously dissociate into ions. This process is known as auto-ionization.
Identify the chemical equation for the auto-ionization of water: The equation is \( \text{H}_2\text{O} \rightleftharpoons \text{H}^+ + \text{OH}^- \). This shows that water dissociates into hydrogen ions (H+) and hydroxide ions (OH-).
Recognize the ions involved: From the equation, it is clear that the ions released during the auto-ionization of water are hydrogen ions (H+) and hydroxide ions (OH-).
Compare with other options: The other ions listed (NH4+, NO3-, Na+, Cl-, Ca2+, CO3^2-) are not involved in the auto-ionization of water. They are associated with different compounds and reactions.
Conclude that the correct ions released during the auto-ionization of water are hydrogen ions (H+) and hydroxide ions (OH-).
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