0
Why is phosphoric acid used in redox titration where diphenylamine is used as indicator?
Wiki User
∙ 12y ago
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.
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
Why is an indicator not used in a redox titration?
Because the endpoints are easily observed.
What is redox titration?
Redox Titration refers to some titration based on the redox reaction between the titrant and analyte.
What is the function of starch solution in the redox titration?
It is used as indicator for the endpoint of a Iodometric (redox) titration: it gives a bluish grey to black color with very minute excess of Iodine-iodide ions (I3-)
The purpose of an indicator in a titration experiment?
The indicator is used to measure the end point of titration. Methyl red and phenolphthalein are frequently used indicators in acid-base titration. Potassium permanganate can used as a self indicator in redox titrations where applicable.
Difference between acid base titration and redox titration?
Acid base titration involves neutralization reaction between an acid and a base. whereas redox titration involves redox reaction between an oxidizing agent and reducing agent.
Why is an indicator not used in a redox titration?
Because the endpoints are easily observed.
What is redox titration?
Redox Titration refers to some titration based on the redox reaction between the titrant and analyte.
What is the function of starch solution in the redox titration?
It is used as indicator for the endpoint of a Iodometric (redox) titration: it gives a bluish grey to black color with very minute excess of Iodine-iodide ions (I3-)
The purpose of an indicator in a titration experiment?
The indicator is used to measure the end point of titration. Methyl red and phenolphthalein are frequently used indicators in acid-base titration. Potassium permanganate can used as a self indicator in redox titrations where applicable.
Difference between acid base titration and redox titration?
Acid base titration involves neutralization reaction between an acid and a base. whereas redox titration involves redox reaction between an oxidizing agent and reducing agent.
Advantages and disadvantages of redox titration?
No
What is the theory of the redox titration?
i dontknow
What are the type of conductometric titration?
types of conductometric titration: acid base titration complexometric titration replacement titration redox titration precipitation titration
What is the reason of heating solution during redox titration?
This is far to be a rule for this titration.
Why you perform heating in redox titration?
Titration is to be done at elevated temperatures to prevent side reactions
Is starch redox indicator?
Starch is a complexometric indicator.
How many tipes of titration?
There are various types of titration. It is dependent on the conditions used and the reactants and desired products. Some of them are acid-base titration, redox titration, colorimetric titration and thermometric titration.
