The equivalence point of any acid titrated with a base occurs when the
A. concentration of the acid and concentration of the titrant are equal.
B. mass of the acid and the mass of the titrant are equal.
C. pH of the mixture of the acid and titrant is 7.0.
D. volume of the acid and the volume of the titrant are equal.
Hi I got A, but I'm second greeting myself with C, can you pleas look at this equation and tell me which answer is correct thank you
C can't be right since the equivalence point for some acid/base titrations is <7 (NH3 and HCl as an example) and some are >7 (NaOH and acetic acid as an example.) Of course you know B and D can't be right. Which leaves only A.
To determine the correct answer, let's review the definition of the equivalence point in an acid-base titration.
The equivalence point is the point during titration where the stoichiometrically equivalent amounts of acid and base have reacted completely. At this point, no excess of either reactant remains.
From the given options, we can eliminate B and D because the equivalence point is not based on the mass or volume of the acid and the titrant.
Now let's discuss options A and C:
A. The concentration of the acid and the concentration of the titrant being equal does not necessarily indicate the equivalence point of an acid-base titration. This is because concentration alone cannot determine the stoichiometric equivalence.
C. The pH of the mixture of the acid and titrant being 7.0 is not necessarily indicative of the equivalence point. The pH of a solution is influenced by the strength and concentration of the acid and base, as well as any other substances present in the solution. Therefore, the pH of the mixture can vary at the equivalence point depending on the specific acid and base being used.
In conclusion, the correct answer is A. The equivalence point of any acid titrated with a base occurs when the concentration of the acid and the concentration of the titrant are equal.
To determine the correct answer, let's first understand the concept of an equivalence point in an acid-base titration.
In an acid-base titration, a solution of known concentration (titrant) is added gradually to a solution of unknown concentration (analyte) until the reaction is complete. The equivalence point is the point at which stoichiometrically equivalent amounts of acid and base have reacted.
Now let's evaluate the given answers:
A. The concentration of the acid and concentration of the titrant are equal.
This answer is correct. At the equivalence point, the moles of acid and base reacted are equal, so their concentrations will be the same.
B. The mass of the acid and the mass of the titrant are equal.
This answer is not necessarily true. Mass is not directly related to equivalence point in an acid-base titration. It is the moles of acid and base that determine the equivalence point.
C. The pH of the mixture of the acid and titrant is 7.0.
This answer is not correct. The pH at the equivalence point can vary depending on the strength of the acid and base involved. It can be acidic, basic, or neutral.
D. The volume of the acid and the volume of the titrant are equal.
This answer is not necessarily true. The volumes of acid and base required to reach the equivalence point depend on their concentrations and stoichiometry, which may or may not be equal.
Therefore, the correct answer is A. The equivalence point occurs when the concentration of the acid and concentration of the titrant are equal.