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Indicators are weak acid. Too much will alter the titre
What else can I help you with?
Why should a constant minimum amount of indicator be used in titrations?
Using a constant minimum amount of indicator in titrations helps ensure uniformity and consistency in the color change, making it easier to detect the endpoint accurately. This helps to minimize errors and improve the precision of the titration results.
How you select that which indicator should be used in any titration?
The selection of an indicator for a titration is based on the pH range over which the titration will occur. The indicator should have a color change that aligns with the pH at the equivalence point of the titration. Choosing an indicator with a pH range that encompasses the equivalence point will ensure accurate endpoint detection.
How much phenolphthalein indicator should be used?
Typically, 1-2 drops of phenolphthalein indicator are sufficient to use in an acid-base titration experiment. It is important not to use too much indicator, as it can affect the accuracy of the titration results.
What criterion is used in selecting an indicator for a particular acid-base titration?
The key criterion for selecting an indicator for an acid-base titration is that the indicator's color change should occur close to the equivalence point of the titration. This ensures that the indicator accurately signals when the reaction is complete. The pH range over which the indicator changes color should match the pH range around the equivalence point.
Why is the choice of the colorimetric indicator in an acid-base titration important?
The choice of colorimetric indicator in an acid-base titration is crucial because it must change color at the equivalence point, where the moles of acid and base are stoichiometrically equal. The indicator should have a pH range close to the pH at the equivalence point to ensure accurate endpoint detection. Using the right indicator helps to determine the endpoint precisely and enhances the accuracy of the titration results.
Why should a constant minimum amount of indicator be used in titrations?
Using a constant minimum amount of indicator in titrations helps ensure uniformity and consistency in the color change, making it easier to detect the endpoint accurately. This helps to minimize errors and improve the precision of the titration results.
How you select that which indicator should be used in any titration?
The selection of an indicator for a titration is based on the pH range over which the titration will occur. The indicator should have a color change that aligns with the pH at the equivalence point of the titration. Choosing an indicator with a pH range that encompasses the equivalence point will ensure accurate endpoint detection.
What creteria is used for chosing an indicator in acid base titration?
pH range of indicator should be in the rapid pH gradient.
If the equivalence point of a titration is 5 what range of pH should the indicator be?
An indicator should have a pKa close to the expected pH at the equivalence point. For a titration with an equivalence point at pH 5, an indicator with a pKa in the range of 4 to 6 would be suitable for visual detection of the endpoint.
How much phenolphthalein indicator should be used?
Typically, 1-2 drops of phenolphthalein indicator are sufficient to use in an acid-base titration experiment. It is important not to use too much indicator, as it can affect the accuracy of the titration results.
What criterion is used in selecting an indicator for a particular acid-base titration?
The key criterion for selecting an indicator for an acid-base titration is that the indicator's color change should occur close to the equivalence point of the titration. This ensures that the indicator accurately signals when the reaction is complete. The pH range over which the indicator changes color should match the pH range around the equivalence point.
Why is the choice of the colorimetric indicator in an acid-base titration important?
The choice of colorimetric indicator in an acid-base titration is crucial because it must change color at the equivalence point, where the moles of acid and base are stoichiometrically equal. The indicator should have a pH range close to the pH at the equivalence point to ensure accurate endpoint detection. Using the right indicator helps to determine the endpoint precisely and enhances the accuracy of the titration results.
What colorimetric pH indicator should you use for ammonia and hydrochloric acid titration?
Since the titration is between a strong acid and a weak base, methylorange should be suitable as the equivalence point is around pH 5. The K of the indicator should be equal to the pH at the end point. Methyl orange is that indicator
Why starch indicator is not added right from the beginning of titration in iodometry?
Starch indicator should not be added at the beginning of an iodometry titration because iodine can form a complex with the starch, resulting in a blue-black color that can obscure the endpoint. It is best to add the starch indicator near the endpoint, when the iodine is almost completely reacted, to help visualize the color change.
Why is phosphoric acid used in redox titration where diphenylamine is used as indicator?
There are three indicators that may be used for the titration of Fe2+ with K2Cr2O7. These are diphenylamine, diphenylbenzidine and diphenylamine sulfonate. The colour change for all three indicators is green to violet and the standard electrode potentials are all ca 0.78 V. According to Kolthoff and Sandell, this should lie between the electrode potentials of the two reduction reactions. This not being the case, phosphoric acid is added to reduce the electrode potential for the Fe3+ → Fe2+ reaction by stabilising the ferric ion.
When do you know endpoint of titration?
The endpoint of a titration is reached when the indicator changes color, signaling that the stoichiometric equivalence point has been reached. This is the point at which the moles of titrant added are chemically equivalent to the moles of analyte in the sample being titrated. It indicates the completion of the reaction and helps determine the concentration of the analyte.
Why is thymol blue used as the indicator for titration of acetic acid and naoh?
Thymol blue changes color in the pH range of 8.0 to 9.6, making it suitable for titrations involving acetic acid (pKa ~ 4.75) and sodium hydroxide. At the equivalence point of the titration, the pH is around 8.5, which falls within the indicator's color change range, allowing for a sharp color transition at the endpoint.
