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The equivalence point, or stoichiometric point, of a chemical reaction is the point at which an added titrant is stoichiometrically equal to the number of moles of substance (known as analyte) present in the sample: the smallest amount of titrant that is sufficient to fully neutralize or react with the analyte.
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∙ 11y ago
The equivalence point of a titration is the point at which the moles of acid are equal to the moles of base (or vice versa) that have been added, resulting in complete neutralization of the solution. This is often indicated by a sharp change in pH, and is used to calculate the concentration of the solution being titrated.
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What is the difference between end point titration and equivalence point?
Endpoint titration refers to the point in a titration where the indicator changes color, signaling that the reaction is complete. Equivalence point, on the other hand, is the point in the titration where the moles of the titrant are stoichiometrically equal to the moles of the analyte. The equivalence point does not necessarily coincide with the endpoint, as the indicator may change color before or after reaching the equivalence point.
Is the equivalence point of a titration always zero?
No, the equivalence point of a titration is not always zero. The equivalence point is the point in a titration where the amount of titrant added is stoichiometrically equivalent to the amount of analyte present in the sample, leading to a neutralization reaction. The pH at the equivalence point depends on the nature of the reaction and the strengths of the acid and base involved.
Why is the point in the titration when neutralization occurs called the equivalence point?
The equivalence point is where the moles of acid and base in a reaction are present in stoichiometrically equal amounts, resulting in complete neutralization. It is called the equivalence point because the reactants are equivalent in terms of their chemical equivalence at this stage of the titration process.
What color will a solution be at the equivalence point of titration?
The color of a solution at the equivalence point of a titration depends on the type of indicator used. The indicator changes color at a specific pH value, signaling the completion of the reaction. Common indicators like phenolphthalein turn pink at the equivalence point of an acid-base titration.
Why is it necessary to continue the titration after the equivalence point has been reached?
Continuing the titration after the equivalence point allows for the detection of excess titrant in the solution. This helps to ensure that the exact amount of titrant required to reach the equivalence point has been added. It also allows for a more accurate determination of the endpoint of the titration.
What is the difference between end point titration and equivalence point?
Endpoint titration refers to the point in a titration where the indicator changes color, signaling that the reaction is complete. Equivalence point, on the other hand, is the point in the titration where the moles of the titrant are stoichiometrically equal to the moles of the analyte. The equivalence point does not necessarily coincide with the endpoint, as the indicator may change color before or after reaching the equivalence point.
Is the equivalence point of a titration always zero?
No, the equivalence point of a titration is not always zero. The equivalence point is the point in a titration where the amount of titrant added is stoichiometrically equivalent to the amount of analyte present in the sample, leading to a neutralization reaction. The pH at the equivalence point depends on the nature of the reaction and the strengths of the acid and base involved.
What is the difference between the end point and the equivalence point?
The equivalence point is the point in a titration when the amount of added standard reagent is chemically equal to the amount of analyte. The end point is the point in a titration when a physical change occurring immediate after the equivalence point
Why is the point in the titration when neutralization occurs called the equivalence point?
The equivalence point is where the moles of acid and base in a reaction are present in stoichiometrically equal amounts, resulting in complete neutralization. It is called the equivalence point because the reactants are equivalent in terms of their chemical equivalence at this stage of the titration process.
What color will a solution be at the equivalence point of titration?
The color of a solution at the equivalence point of a titration depends on the type of indicator used. The indicator changes color at a specific pH value, signaling the completion of the reaction. Common indicators like phenolphthalein turn pink at the equivalence point of an acid-base titration.
Why is it necessary to continue the titration after the equivalence point has been reached?
Continuing the titration after the equivalence point allows for the detection of excess titrant in the solution. This helps to ensure that the exact amount of titrant required to reach the equivalence point has been added. It also allows for a more accurate determination of the endpoint of the titration.
How does the equivalence point differ from the endpoint of a titration?
The equivalence point in a titration is the point at which the moles of titrant added are stoichiometrically equivalent to the moles of analyte present. The endpoint is when an indicator used in the titration changes color, signaling the completion of the reaction. The equivalence point is a calculated value based on the stoichiometry of the reaction, while the endpoint is detected visually.
Does The equivalence point and the end point of a titration occur at the same place in a titration?
The equivalence point and the end point of a titration do not always occur at the same place. The equivalence point is the point at which stoichiometrically equivalent amounts of reactants have been mixed, while the end point is when the indicator changes color. In ideal conditions, the end point would occur at the equivalence point, but this is not always the case due to factors like human error or issues with the indicator.
How would the pH of the equivalence point for standard solution titration differ from a strong acid-strong base titration?
The pH at the equivalence point of a strong acid-strong base titration would be 7, as the solution is neutralized. In contrast, the pH at the equivalence point for a standard solution titration would depend on the nature of the reaction and the strengths of the acids and bases involved.
What is the approximate pH of the equivalence point in the titration pH curve?
The approximate pH of the equivalence point in a titration pH curve is around 7 for a strong acid-strong base titration. This is because at the equivalence point, the moles of acid are equal to the moles of base, resulting in a neutral solution.
Why does the pH change rapidly at the equivalence point of a titration?
The equivalence point represents a region where the amount of acid to base (or base to acid) concentration is equal. Before the equivalence point there is a greater amount of acid (or base, depending on the titration). After the titration there is a greater amount of base (or acid). This reverse in dominance results in a dramatic change in pH.
In a titration when does the indicator change color?
The indicator changes color at the endpoint of the titration, which is when the reaction between the analyte and titrant is chemically complete. This change in color helps signal that the equivalence point has been reached.
