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What can be said about the pH of a salt formed by a weak acid and a weak base?
- a)The pH will always be exactly 7.
- b)The pH will always be less than 7.
- c)The pH will always be greater than 7.
- d)The pH cannot be predicted.
Correct answer is option 'D'. Can you explain this answer?
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What can be said about the pH of a salt formed by a weak acid and a we...
Understanding pH of Salts from Weak Acids and Bases
When a salt is formed from a weak acid and a weak base, predicting its pH can be complex. Here's why:
Nature of the Components
- Weak Acid: A weak acid only partially dissociates in water, meaning it does not release all its hydrogen ions (H+).
- Weak Base: A weak base also partially dissociates, producing hydroxide ions (OH-) to a limited extent.
Hydrolysis Reaction
- When the salt dissolves in water, hydrolysis occurs. The anions from the weak acid and the cations from the weak base can react with water, affecting the pH.
Factors Influencing pH
- Strength of Acid and Base: The degree of dissociation of both the weak acid and weak base plays a critical role. If one is significantly weaker than the other, it will dominate the pH outcome.
- Concentration: The concentrations of the salt solution also influence how much the salt will hydrolyze and thus the resulting pH.
Conclusion
- Since the pH depends on the relative strengths of the weak acid and weak base, it can be less than, greater than, or equal to 7.
- Therefore, without specific information about the acid and base involved, it is impossible to predict the pH of the resulting salt solution accurately.
This complexity leads to the conclusion that the pH cannot be predicted definitively, which is why option 'D' is the correct answer.
When a salt is formed from a weak acid and a weak base, predicting its pH can be complex. Here's why:
Nature of the Components
- Weak Acid: A weak acid only partially dissociates in water, meaning it does not release all its hydrogen ions (H+).
- Weak Base: A weak base also partially dissociates, producing hydroxide ions (OH-) to a limited extent.
Hydrolysis Reaction
- When the salt dissolves in water, hydrolysis occurs. The anions from the weak acid and the cations from the weak base can react with water, affecting the pH.
Factors Influencing pH
- Strength of Acid and Base: The degree of dissociation of both the weak acid and weak base plays a critical role. If one is significantly weaker than the other, it will dominate the pH outcome.
- Concentration: The concentrations of the salt solution also influence how much the salt will hydrolyze and thus the resulting pH.
Conclusion
- Since the pH depends on the relative strengths of the weak acid and weak base, it can be less than, greater than, or equal to 7.
- Therefore, without specific information about the acid and base involved, it is impossible to predict the pH of the resulting salt solution accurately.
This complexity leads to the conclusion that the pH cannot be predicted definitively, which is why option 'D' is the correct answer.
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What can be said about the pH of a salt formed by a weak acid and a weak base?a)The pH will always be exactly 7.b)The pH will always be less than 7.c)The pH will always be greater than 7.d)The pH cannot be predicted.Correct answer is option 'D'. Can you explain this answer?? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about What can be said about the pH of a salt formed by a weak acid and a weak base?a)The pH will always be exactly 7.b)The pH will always be less than 7.c)The pH will always be greater than 7.d)The pH cannot be predicted.Correct answer is option 'D'. Can you explain this answer?? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What can be said about the pH of a salt formed by a weak acid and a weak base?a)The pH will always be exactly 7.b)The pH will always be less than 7.c)The pH will always be greater than 7.d)The pH cannot be predicted.Correct answer is option 'D'. Can you explain this answer??.
What can be said about the pH of a salt formed by a weak acid and a weak base?a)The pH will always be exactly 7.b)The pH will always be less than 7.c)The pH will always be greater than 7.d)The pH cannot be predicted.Correct answer is option 'D'. Can you explain this answer?? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about What can be said about the pH of a salt formed by a weak acid and a weak base?a)The pH will always be exactly 7.b)The pH will always be less than 7.c)The pH will always be greater than 7.d)The pH cannot be predicted.Correct answer is option 'D'. Can you explain this answer?? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What can be said about the pH of a salt formed by a weak acid and a weak base?a)The pH will always be exactly 7.b)The pH will always be less than 7.c)The pH will always be greater than 7.d)The pH cannot be predicted.Correct answer is option 'D'. Can you explain this answer??.
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