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Phosphoric acid is used as a pH buffer in redox titrations to maintain a stable acidic environment, which is necessary for the reaction to proceed at a consistent rate. It also helps prevent the precipitation of metal hydroxides and ensures the correct formation of complexes that are vital for the titration process.
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Difference between acid base titration and redox titration?
In acid-base titration, the reaction involves the transfer of protons between the acid and base, with the endpoint usually determined by a pH indicator. Redox titration, on the other hand, involves the transfer of electrons between the oxidizing and reducing agents, with the endpoint typically determined by a change in color or potential. Acid-base titrations are used to determine the concentration of acids or bases, while redox titrations are to determine the concentration of oxidizing or reducing agents.
Why sulfuric acid is used in Redox titration instead of HNO3?
Sulfuric acid is commonly used in redox titrations because it is a strong acid and does not participate in the redox reactions. Nitric acid (HNO3) can act as an oxidizing agent itself, which can interfere with the redox titration process by introducing additional reactions.
Why is ascorbic acid titrated by redox titration?
Ascorbic acid is titrated by redox titration because it readily undergoes oxidation. The ascorbic acid molecule itself acts as a reducing agent that can be oxidized to form dehydroascorbic acid. The endpoint of the titration is reached when all the ascorbic acid has been oxidized.
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.
What is the role of phosphoric acid in titration?
Phosphoric acid is often used as a buffer in titration reactions to stabilize the pH of the solution. It helps maintain a constant pH by resisting changes in acidity when small amounts of acid or base are added during the titration process. This is important for ensuring the accuracy and precision of the titration results.
Difference between acid base titration and redox titration?
In acid-base titration, the reaction involves the transfer of protons between the acid and base, with the endpoint usually determined by a pH indicator. Redox titration, on the other hand, involves the transfer of electrons between the oxidizing and reducing agents, with the endpoint typically determined by a change in color or potential. Acid-base titrations are used to determine the concentration of acids or bases, while redox titrations are to determine the concentration of oxidizing or reducing agents.
Why sulfuric acid is used in Redox titration instead of HNO3?
Sulfuric acid is commonly used in redox titrations because it is a strong acid and does not participate in the redox reactions. Nitric acid (HNO3) can act as an oxidizing agent itself, which can interfere with the redox titration process by introducing additional reactions.
Why is ascorbic acid titrated by redox titration?
Ascorbic acid is titrated by redox titration because it readily undergoes oxidation. The ascorbic acid molecule itself acts as a reducing agent that can be oxidized to form dehydroascorbic acid. The endpoint of the titration is reached when all the ascorbic acid has been oxidized.
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.
What is the role of phosphoric acid in titration?
Phosphoric acid is often used as a buffer in titration reactions to stabilize the pH of the solution. It helps maintain a constant pH by resisting changes in acidity when small amounts of acid or base are added during the titration process. This is important for ensuring the accuracy and precision of the titration results.
What are the method of titration?
The methods of titration include acid-base titration, redox titration, and complexometric titration. Acid-base titration involves the reaction between an acid and a base to determine the concentration of one of the reactants. Redox titration involves oxidation-reduction reactions to determine the concentration of a substance. Complexometric titration involves the formation of a complex between a metal ion and a complexing agent to determine the concentration of the metal ion.
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.
How can you calculate the concentration of a phosphoric acid solution from the titration with sodium hydroxide?
You can calculate the concentration of a phosphoric acid solution by determining the volume of sodium hydroxide needed to neutralize it in a titration. The molarity of the sodium hydroxide solution and the balanced chemical equation for the reaction will allow you to find the moles of phosphoric acid present, hence the concentration.
What are different types of titration?
There are several types of titration techniques, including acid-base titration (determining the concentration of an acid or base), redox titration (determining the concentration of oxidizing or reducing agents), complexometric titration (determining the metal ion concentration using a complexing agent), and precipitation titration (determining the concentration of a dissolved substance by precipitating it).
What is the function of sulfuric acid in redox titration?
Sulphuric Acid (H2SO4) is used in the redox titration process because it provides the H(+) ions necessary for the reaction to occur more quickly whilst the sulphate(-) ions barely react during the reaction.
Why there is a need to warm the solution of sulfuric acid and oxalic acid during redox titration?
Warming the solution of sulfuric acid and oxalic acid during redox titration increases the reaction rate, making the titration process faster and more efficient. The elevated temperature helps to ensure that the reaction between the two compounds proceeds to completion, resulting in more accurate and reliable titration results.
Why redox titration is more useful than acid base titration?
Redox titrations can be used to quantify substances that do not react with acids or bases, such as reducing agents. This makes redox titrations more versatile in terms of the types of substances that can be analyzed compared to acid-base titrations. Additionally, redox titrations are more sensitive and can provide more precise results in certain cases.
