Determine if each of the following diagrams represents a strong acid or a weak acid. The acid has the formula HX.

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Step 1: Analyze the diagrams provided. The left diagram shows a solution where almost all molecules of HX have dissociated into H₃O⁺ and A⁻ ions, while the right diagram shows a solution where only a few molecules of HX have dissociated, leaving most of the HX molecules intact.

Step 2: Recall the definition of a strong acid. A strong acid completely dissociates in water, meaning that nearly all acid molecules (HX) break apart into H₃O⁺ and A⁻ ions.

Step 3: Recall the definition of a weak acid. A weak acid only partially dissociates in water, meaning that most of the acid molecules (HX) remain intact, with only a small fraction breaking apart into H₃O⁺ and A⁻ ions.

Step 4: Compare the diagrams to the definitions. The left diagram represents a strong acid because it shows complete dissociation of HX into H₃O⁺ and A⁻ ions. The right diagram represents a weak acid because it shows partial dissociation, with many HX molecules remaining intact.

Step 5: Conclude that the left diagram corresponds to a strong acid, while the right diagram corresponds to a weak acid, based on the degree of dissociation observed in each solution.

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Strong Acids vs. Weak Acids

Strong acids completely dissociate in water, meaning that all of the acid molecules break apart into ions. This results in a high concentration of hydronium ions (H3O+) in solution. In contrast, weak acids only partially dissociate, leading to a lower concentration of H3O+ and a mixture of undissociated acid molecules and ions.

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01:02

Strong Acid Strong Base Titrations (Simplified) Concept 1

Dissociation Equilibrium

The dissociation of acids in water can be described by an equilibrium reaction. For weak acids, the equilibrium lies to the left, indicating that a significant amount of the acid remains undissociated. In strong acids, the equilibrium lies far to the right, favoring the formation of ions, which is why they are considered strong.

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The Equilibrium Constant Example 1

Acid Strength and pH

The strength of an acid is often measured by its pH level, which indicates the concentration of H3O+ ions in solution. Strong acids typically have a low pH (below 3), while weak acids have a higher pH (above 3). Understanding the relationship between acid strength and pH is crucial for determining the nature of the acid represented in the diagrams.

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