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Chapter 2: Problem 18

Name two ions that are the products of the dissociation of water.

Short Answer

Expert verified
The ions are H^+ and OH^-.

Step by step solution

01

Understand the Concept of Dissociation of Water

Dissociation of water refers to the process where water ( H_2O) molecules split into ions. This is due to the movement of protons (H^+ ions) between water molecules.
02

Identify the Ions Formed

When a water molecule dissociates, it forms two types of ions: a hydrogen ion (H^+) and a hydroxide ion (OH^-). These are the ions commonly produced through the dissociation of water at a neutral pH.
03

Write the Chemical Equation

Express the dissociation of water using a chemical equation: H_2O ightarrow H^+ + OH^-. This equation illustrates how water splits into its ionic components.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Hydrogen Ions
In the context of the dissociation of water, a hydrogen ion is crucial. It is represented by the symbol \( H^+ \). When water molecules dissociate, a proton is released, creating a hydrogen ion. Its presence is an indicator of acidity in a solution.
In water, the hydrogen ion doesn't freely exist for long. Instead, it typically bonds to a nearby water molecule to form hydronium \( H_3O^+ \). Despite this, we often refer to the simplest ion form as \( H^+ \).
  • Represents the simplest form of a proton.
  • Significant in determining the acidity level of solutions.
This ion plays a pivotal role in many chemical reactions and is central to understanding concepts of pH and acidity.
Exploring Hydroxide Ions
Hydroxide ions, commonly symbolized as \( OH^- \), are another product of water's dissociation.
When a water molecule splits, what remains is a hydroxide ion. The presence of \( OH^- \) ions in a solution indicates basicity or alkalinity.
  • Consists of one oxygen and one hydrogen atom, carrying a negative charge.
  • Indicative of a basic or alkaline environment when abundant.
Hydroxide ions are essential in studying the properties of bases, balancing chemical equations, and ensuring neutrality in aqueous solutions.
The Role of Chemical Equations
Chemical equations are a vital tool in Chemistry. They succinctly describe chemical reactions, such as the dissociation of water. For water, the chemical equation is: \[ H_2O \rightleftharpoons H^+ + OH^- \] This equation shows how water molecules split into a hydrogen ion and a hydroxide ion.
  • Represents the conservation of mass where atom numbers are balanced on both sides.
  • Helps visualize the transformation of reactants to products.
Writing chemical equations allows scientists and students to predict the outcome of chemical reactions and understand the dynamics of different reaction mechanisms.

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