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In which of the following acid-base titration pH is greater than8 at the equivalence point ?
- a)Acetic acid versus ammonia
- b)Acetic acid versus sodium hydroxide
- c)Hydrochloride acid versus ammonia
- d)Hydrochloric acid versus sodium hydroxide
Correct answer is option 'A'. Can you explain this answer?
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In which of the following acid-base titration pH is greater than8 at t...
Acid-Base Titration and Equivalence Point
In an acid-base titration, a strong acid reacts with a strong base (or vice versa) to determine the concentration of the unknown solution. The process involves adding a known concentration of one solution (titrant) to another solution (analyte) until the reaction reaches the equivalence point. At the equivalence point, the moles of acid are equal to the moles of base, resulting in neutralization.
pH at the Equivalence Point
The pH at the equivalence point depends on the nature of the acid and base being titrated. In general, if a strong acid reacts with a strong base, the pH at the equivalence point will be 7, which is neutral. However, if a weak acid or a weak base is involved in the titration, the pH at the equivalence point can be different from 7.
Acetic Acid versus Ammonia
In the given options, the titration of acetic acid (weak acid) with ammonia (weak base) is the only combination where the pH is greater than 8 at the equivalence point. This is because acetic acid is a weak acid that does not completely dissociate in water, resulting in a low concentration of H+ ions. Ammonia is a weak base that accepts H+ ions, but its concentration of OH- ions is also low.
During the titration, as the acetic acid reacts with ammonia, the concentration of H+ ions decreases, and the concentration of OH- ions increases. At the equivalence point, when the moles of acetic acid are equal to the moles of ammonia, the resulting solution will have a higher concentration of OH- ions, leading to a pH greater than 8. This is because the solution becomes more basic due to the excess of OH- ions.
Conclusion
In summary, during the titration of acetic acid versus ammonia, the pH at the equivalence point is greater than 8. This is because acetic acid is a weak acid and ammonia is a weak base, resulting in a solution that is more basic at the equivalence point.
In an acid-base titration, a strong acid reacts with a strong base (or vice versa) to determine the concentration of the unknown solution. The process involves adding a known concentration of one solution (titrant) to another solution (analyte) until the reaction reaches the equivalence point. At the equivalence point, the moles of acid are equal to the moles of base, resulting in neutralization.
pH at the Equivalence Point
The pH at the equivalence point depends on the nature of the acid and base being titrated. In general, if a strong acid reacts with a strong base, the pH at the equivalence point will be 7, which is neutral. However, if a weak acid or a weak base is involved in the titration, the pH at the equivalence point can be different from 7.
Acetic Acid versus Ammonia
In the given options, the titration of acetic acid (weak acid) with ammonia (weak base) is the only combination where the pH is greater than 8 at the equivalence point. This is because acetic acid is a weak acid that does not completely dissociate in water, resulting in a low concentration of H+ ions. Ammonia is a weak base that accepts H+ ions, but its concentration of OH- ions is also low.
During the titration, as the acetic acid reacts with ammonia, the concentration of H+ ions decreases, and the concentration of OH- ions increases. At the equivalence point, when the moles of acetic acid are equal to the moles of ammonia, the resulting solution will have a higher concentration of OH- ions, leading to a pH greater than 8. This is because the solution becomes more basic due to the excess of OH- ions.
Conclusion
In summary, during the titration of acetic acid versus ammonia, the pH at the equivalence point is greater than 8. This is because acetic acid is a weak acid and ammonia is a weak base, resulting in a solution that is more basic at the equivalence point.
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In which of the following acid-base titration pH is greater than8 at the equivalence point ?a)Acetic acid versus ammoniab)Acetic acid versus sodium hydroxidec)Hydrochloride acid versus ammoniad)Hydrochloric acid versus sodium hydroxideCorrect answer is option 'A'. Can you explain this answer?
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