Correct Answer: Decreases
Subject: chemistry
Explanation: • <b>Key Fact</b> Mixing an acid or a base with water results in a decrease in the concentration of ions (H₃O⁺/OH⁻) per unit volume. • <b>Supporting Detail</b> This process is known as dilution, and the acid or base is said to be diluted. • <b>Related Concept</b> As the concentration of H⁺ ions decreases, the pH of the acidic solution increases towards 7. • <b>Why wrong options are wrong</b> Increasing concentration would mean adding more acid, not adding water. • <b>Exam Trick</b> Dilution = Less power per drop = Decreased ion concentration. • <b>Additional Info</b> The process of dissolving an acid in water is highly exothermic.
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