Questions and Answers
What is the conjugate base of the weak acid NH₃?
NH₂⁻
A salt has a pH of 9. What can be inferred about the salt?
The salt is basic in nature.
What is the pH of a solution formed by the reaction of a strong acid and a strong base in equivalent amounts?
7
What is the common ion effect in acid-base equilibria?
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What is the difference between a strong acid and a weak acid?
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Study Notes
Acid-Base Chemistry
- The conjugate base of the weak acid NH₃ is NH₂⁻ (amide ion).
pH of a Salt Solution
- If a salt has a pH of 9, it can be inferred that the salt is a basic salt, likely formed from the reaction of a strong base with a weak acid.
pH of a Strong Acid-Strong Base Reaction
- The pH of a solution formed by the reaction of a strong acid and a strong base in equivalent amounts is 7, which is neutral.
The Common Ion Effect
- The common ion effect in acid-base equilibria refers to the suppression of the ionization of a weak acid or a weak base by the presence of a common ion, which is an ion that is already present in the solution.
Strong vs. Weak Acids
- A strong acid is completely dissociated in water, releasing all its hydrogen ions (H⁺), whereas a weak acid only partially dissociates, releasing some of its hydrogen ions.
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Description
Test your knowledge of acid-base chemistry, including conjugate bases, pH levels, and the common ion effect, as per the 10th class curriculum.