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For preparation of standard solution of Mohr salt {FeSO4.(NH4)2SO4.6H2O}, it's necessary to add dilute H2SO4 to prevent the Fe2+ ions of Mohr salt solution from undergoing oxidation (to Fe3+).
Just try to prepare the standard solution without adding this acid. You'll observe that your "Mohr solution" will become yellow in colour, i.e., it won't remain "Mohr salt solution" anymore, hence can't be used in titration.
And while doing the titration of the Mohr salt solution with KMnO4 (or even with K2Cr2O7), you need to add dilute H2SO4. The reason is well explained by the chemical equation involved:
reduction: (MnO4)- + 8H+ + 5e ----> Mn2+ + 4H2O
oxidation: Fe2+ ----> Fe3+ + e
net equation:
(MnO4)- + 8H+ + 5Fe2+ ----> Mn2+ + 4H2O + 5Fe3+
There is involvement of H+ ions in this reaction. This redox titration requires acidic medium. Moreover, KMnO4 acts as a very good oxidizing agent in the presence of acidic medium, than in the basic and neutral medium.
NOTE: Now a query may arise that for providing acidic medium, can HCl or HNO3 be used? (Let me tell you it's one of the favourite questions of external examiners)
The answer is NO, because HNO3 is a very strong oxidizing agent. So, the Fe2+ present will be oxidized both by KMnO4 and HNO3, which will result in an error in determination of volume of KMnO4 reacting with Mohr salt solution.
Also, HCl can't be used because Cl- from HCl will be oxidized by KMnO4:
HCl (aq) ---> H+ (aq) +Cl- (aq)
oxidation by KMnO4=> 2Cl- ----> Cl2 + 2e
So, some extra KMnO4 will be used up because it will oxidize both- Cl- as well as Fe2+, => error in titration
Sulfuric acid is used in the standardization of potassium permanganate because it serves as a catalyst in the reaction. It helps to ensure that the reaction between the permanganate and the reducing agent (such as oxalic acid) proceeds quickly and completely. Additionally, sulfuric acid provides a stable acidic environment for the reaction to occur smoothly and reliably.
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Potassium permanganate is not a primary standard. It is not easily obtained in perfectly pure form which is completely free from manganese dioxide. Also the aqueous solutions are not stable for long as the ordinary distilled water usually contains reducing substances (traces of organic matter, etc.) which react with permanganate resulting in precipitation of MnO2. This reaction is catalysed by light. Presence of manganese dioxide is totally undesirable as it catalyses the auto decomposition of the permanganate ion on standing:
4MnO4¯ + 2H2O → 4MnO2 + 3O2 + 4 OH¯
Permanganate solution decompose in presence of manganous ions also:
2MnO4¯ + 3 Mn2+ + 2H2O = 5MnO2 + 4H+
The reaction is quite slow in acidic medium but attains a fast rate in neutral solutions.
Thus Permanganate solution can not be considered as a primary standard solution by simply making the calculations based on the amount of permanganate weighed and dissolved. The permanganate solutions once prepared are either left for a day or two or the freshly prepared solutions are boiled for an hour. In both the cases the resulting solution is filtered through sintered glass crucibles. The clear solutions so obtained are then standardized by titrating with a primary standard solution
Firstly, the reaction between Iron(II) Oxalate and Potassium Manganate(VII) is a redox reaction where Iron(II) ions oxidize to Iron(III) ions and; Manganate(VII) ions reduce to Manganese(II) ions or Manganate(IV) ions in acidic and neutral/alkaline media respectively.
In fact, Sulphuric(VI) Acid is used as a reagent when this experiment takes place in an acidic medium. The main reason, or the obvious reason for using Sulphuric(VI) Acid is the addition of H+ ions to the system (i.e. to the titration flask). In case of this reaction, there is another important reason for using sulphuric acid.
Assume that a different acid such as Nitric(V) Acid, Hydrochloric Acid or Phosphoric(V) Acid. These acids contain ions such as NO3-, Cl-, PO43- which would also react with the added permanganate ions. Then, an excess amount of permanganate ions will be used, and the burette reading becomes erroneous. The sulphate ions will not interfere the reaction in standard conditions, hence Sulphuric(VI) Acid is used in this redox titration.
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Which reaction produces more pure oxygen which is not united with other elements solid potassium permanganate with hydrogen peroxide solid potassium permanganate with Sulfuric acid with H2O2?
The reaction between solid potassium permanganate and hydrogen peroxide will produce more pure oxygen not united with other elements. This is because the reaction is more direct and doesn't involve the additional step of reacting with sulfuric acid.
Why does HCl not used to acidify the media in potassium permanganate titration?
HCl is not used to acidify the media in potassium permanganate titration because it can react with potassium permanganate, which can interfere with the titration results. Sulfuric acid is usually preferred as it does not react with potassium permanganate and ensures accurate titration results.
What is the reaction between potassium permanganate and sulphuric acid and oxalic acid?
With potassium permanganate and sulfuric acid, a redox reaction occurs where potassium permanganate is reduced to manganese(II) ions and sulfuric acid is oxidized. With oxalic acid, potassium permanganate undergoes a redox reaction where it is reduced to manganese(II) ions and oxalic acid is oxidized to carbon dioxide and water.
Why do not use Hcl instead of H2SO4 in preparation of potassium permanganate?
Hydrochloric acid (HCl) may react with the potassium permanganate produced, leading to undesirable side reactions. Sulfuric acid (H2SO4) is chosen because it is a non-oxidizing acid that maintains the stability and purity of the final product.
What will happen if hydrochloric acid is used instead of sulfuric acid in permanganometric titrations?
Hydrochloric acid will react with permanganate, but more violently than sulfuric acid, leading to inaccurate results. Additionally, hydrochloric acid will produce chlorine gas, which can be hazardous. It is best to use sulfuric acid for permanganometric titrations to ensure accurate and safe results.
Which reaction produces more pure oxygen which is not united with other elements solid potassium permanganate with hydrogen peroxide or solid potassium permanganate with Sulfuric acid with H2O2?
The reaction that produces more pure oxygen which is not united with other elements is solid potassium permanganate with hydrogen peroxide rather than solid potassium permanganate with sulfuric acid with H2O2.
Which reaction produces more pure oxygen which is not united with other elements solid potassium permanganate with hydrogen peroxide solid potassium permanganate with Sulfuric acid with H2O2?
The reaction between solid potassium permanganate and hydrogen peroxide will produce more pure oxygen not united with other elements. This is because the reaction is more direct and doesn't involve the additional step of reacting with sulfuric acid.
Why does HCl not used to acidify the media in potassium permanganate titration?
HCl is not used to acidify the media in potassium permanganate titration because it can react with potassium permanganate, which can interfere with the titration results. Sulfuric acid is usually preferred as it does not react with potassium permanganate and ensures accurate titration results.
What is the reaction between potassium permanganate and sulphuric acid and oxalic acid?
With potassium permanganate and sulfuric acid, a redox reaction occurs where potassium permanganate is reduced to manganese(II) ions and sulfuric acid is oxidized. With oxalic acid, potassium permanganate undergoes a redox reaction where it is reduced to manganese(II) ions and oxalic acid is oxidized to carbon dioxide and water.
Why do not use Hcl instead of H2SO4 in preparation of potassium permanganate?
Hydrochloric acid (HCl) may react with the potassium permanganate produced, leading to undesirable side reactions. Sulfuric acid (H2SO4) is chosen because it is a non-oxidizing acid that maintains the stability and purity of the final product.
What happen if the potassium permanganate solution drop to the water and add of concentrated sulfuric acid?
When potassium permanganate solution is dropped into water, it dissolves and forms a purple solution. If concentrated sulfuric acid is then added, the manganese in potassium permanganate can be reduced to form a colorless compound. This reaction generates heat and can be exothermic. The resulting solution will likely be colorless or have a faint pink hue instead of the original purple color.
What will happen if hydrochloric acid is used instead of sulfuric acid in permanganometric titrations?
Hydrochloric acid will react with permanganate, but more violently than sulfuric acid, leading to inaccurate results. Additionally, hydrochloric acid will produce chlorine gas, which can be hazardous. It is best to use sulfuric acid for permanganometric titrations to ensure accurate and safe results.
What is product when vanillin treated with potassium permanganate?
Reaction scheme of vanillin with potassium permanganate to vanillic acid...:)
Why you use dilute H2SO4 in titration permanganat and oxalic acid?
Dilute sulfuric acid is used in the titration of potassium permanganate with oxalic acid because it helps to maintain a stable pH and prevents the oxidation of oxalic acid by permanganate ions. This ensures accurate results by minimizing side reactions and interference.
In the neutralisation of sulfuric acid by potassium hydroxide what displaces the hydrogen in the acid?
Potassium displaces the hydrogen in sulfuric acid when reacting with potassium hydroxide to form potassium sulfate and water.
Why potassium permanganate is used as a self indicator in the titration of oxalic acid?
Potassium permanganate is used as a self-indicator in the titration of oxalic acid because the initial pink color of potassium permanganate is decolorized in the presence of oxalic acid due to its reducing properties. The endpoint of the titration is reached when all the oxalic acid has reacted with the potassium permanganate, causing the pink color to persist. This change in color helps in determining the equivalence point of the titration.
What salt is formed in potassium carbonate and sulphuric acid?
Potassium sulfate is formed when potassium carbonate reacts with sulfuric acid. This reaction combines the potassium from potassium carbonate and the sulfate from sulfuric acid, forming potassium sulfate as the salt product.
