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Which of the following is a strong electrolyte, a weak electrolyte, or a nonelectrolyte in an aqueous solution? Explain your reasoning. a. potassium hydroxide b. ammonia c. calcium chloride d. butanoic acid

Short Answer

Expert verified
KOH and CaCl鈧 are strong electrolytes, NH鈧 is a weak electrolyte, and butanoic acid is a weak electrolyte.

Step by step solution

01

Understanding Electrolytes

Electrolytes are substances that dissociate into ions when dissolved in water. Strong electrolytes dissociate completely, weak electrolytes dissociate partially, and nonelectrolytes do not dissociate into ions at all.
02

Analyze Potassium Hydroxide (KOH)

Potassium hydroxide is a strong base and dissociates completely in water to produce potassium ions (K鈦) and hydroxide ions (OH鈦). Therefore, KOH is a strong electrolyte.
03

Analyze Ammonia (NH鈧)

Ammonia, when dissolved in water, partially reacts to form ammonium ions (NH鈧勨伜) and hydroxide ions (OH鈦), but the reaction is not complete. This makes ammonia a weak electrolyte.
04

Analyze Calcium Chloride (CaCl鈧)

Calcium chloride is a salt that dissociates completely in water into calcium ions (Ca虏鈦) and chloride ions (Cl鈦). Thus, CaCl鈧 is a strong electrolyte.
05

Analyze Butanoic Acid (C鈧僅鈧嘋OOH)

Butanoic acid is a weak acid and does not completely dissociate in water, forming very few ions. Therefore, it is classified as a weak electrolyte.

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Key Concepts

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

Strong Electrolytes
Strong electrolytes are substances that dissolve completely in water to produce ions. This means that in an aqueous solution, they're fully dissociated into their respective charged particles.
As a result, these electrolytes conduct electricity very well due to the presence of a high concentration of ions.
Common examples of strong electrolytes include strong acids like hydrochloric acid (HCl), strong bases such as sodium hydroxide (NaOH) and potassium hydroxide (KOH), and most salts like calcium chloride (CaCl鈧).
When you dissolve CaCl鈧 in water, it splits into calcium ions (Ca虏鈦) and chloride ions (Cl鈦), making it a strong electrolyte.
  • Complete dissociation into ions
  • High conductivity in water
  • Includes strong acids, strong bases, and most salts
Weak Electrolytes
Weak electrolytes only partially dissociate into ions when dissolved in water.
This means that in an aqueous solution, they exist in a mixture of undissociated molecules and ions.
Because of this partial ionization, weak electrolytes tend to conduct electricity poorly compared to strong electrolytes.
Examples include weak acids like acetic acid (CH鈧僀OOH) and weak bases like ammonia (NH鈧).
When ammonia is dissolved in water, it doesn't dissociate fully, meaning not all NH鈧 molecules form ions, making it a weak electrolyte.
  • Partial dissociation into ions
  • Poor electrical conductivity
  • Consist of weak acids and bases
Nonelectrolytes
Nonelectrolytes are substances that do not dissociate into ions when dissolved in water.
In aqueous solutions, they remain as whole molecules rather than splitting into charged particles.
Because they produce no ions, nonelectrolytes cannot conduct electricity. This means that solutions of nonelectrolytes are poor conductors of electricity.
Examples include most organic compounds, like sugar or ethanol, which dissolve in water but don't form ions.
  • No dissociation into ions
  • No electrical conductivity
  • Typically organic compounds
Aqueous Solutions
An aqueous solution is a solution where water acts as the solvent.
This means that the substance, whether it's an electrolyte or nonelectrolyte, dissolves in water to form the solution.

Role of Water

Water is a polar solvent, which means it has positive and negative ends. This polarity allows it to interact with various substances, making them dissolve or ionize.

Behavior of Solutions

In aqueous solutions, how a substance behaves鈥攚hether it ionizes fully, partially, or not at all鈥攄etermines if it is a strong electrolyte, weak electrolyte, or nonelectrolyte.

Importance

Aqueous solutions are important in many fields such as chemistry and biology because they simulate the environment within living organisms. Understanding whether a substance behaves as a strong, weak, or non-electrolyte in water can provide insight into its potential reactions and conductivity.
  • Water as a solvent
  • Solubility affected by polarity
  • Conductivity depends on the type of electrolyte

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