I am in lab working with a substance. When placed in pure water it completely dissociates and the pH of the water becomes 9.4. What do you think the substance is, and what happened to the hydrogen ion concentration of the water?
it is a base and the hydrogen ion concentration increased
it is an acid and the hydrogen ion concentration decreased
it is a base and the hydrogen ion concentration decreased
it is a buffer and the hydrogen ion concentration increased
The Correct Answer is C
A. it is a base and the hydrogen ion concentration increased: A base decreases H⁺ concentration by accepting H⁺ or releasing OH⁻.
B. it is an acid and the hydrogen ion concentration decreased: Acids increase H⁺ concentration, and a pH of 9.4 is basic, not acidic.
C. it is a base and the hydrogen ion concentration decreased: A pH of 9.4 is above 7, indicating a basic solution, and bases lower H⁺ concentration.
D. it is a buffer and the hydrogen ion concentration increased: A buffer resists changes in pH; it doesn't make pH jump to 9.4. Also, H⁺ would not increase in a basic environment.
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Related Questions
Correct Answer is C
Explanation
A. it is a base and the hydrogen ion concentration increased: A base decreases H⁺ concentration by accepting H⁺ or releasing OH⁻.
B. it is an acid and the hydrogen ion concentration decreased: Acids increase H⁺ concentration, and a pH of 9.4 is basic, not acidic.
C. it is a base and the hydrogen ion concentration decreased: A pH of 9.4 is above 7, indicating a basic solution, and bases lower H⁺ concentration.
D. it is a buffer and the hydrogen ion concentration increased: A buffer resists changes in pH; it doesn't make pH jump to 9.4. Also, H⁺ would not increase in a basic environment.
Correct Answer is D
Explanation
A. it is a decomposition dehydration reaction: Dehydration removes water, but this reaction adds water (H₂O).
B. it is an anabolic reaction: Anabolic reactions build larger molecules from smaller ones. This reaction is breaking a molecule apart.
C. it is an exchange reaction: Exchange reactions involve swapping parts between molecules—not just splitting.
D. it is a decomposition hydrolysis reaction: This is a decomposition (breaking down) reaction using hydrolysis (water added to break bonds).
E. it is a synthesis dehydration reaction: That would involve joining molecules together and removing water, which is not the case here.
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