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Why 2N sulphuric acid is used in oxalic acid estimation?
This titration is based on the neutralization reaction between oxalic acid and sulfuric acid; a pH indicator is used.
How do you determine the pka of oxalic acid?
To determine the pKa of oxalic acid, you can perform a titration experiment. By titrating a solution of oxalic acid with a strong base such as sodium hydroxide (NaOH) and monitoring the pH changes, you can identify the point where the acid is half-neutralized and calculate the pKa value. This is typically done using a pH meter or pH indicator to track the changes in acidity as the titration progresses.
Can oxalic acid be titrated by HCl?
Yes, oxalic acid can be titrated by HCl because oxalic acid is a diprotic acid and can react with HCl in a simple acid-base reaction. The titration involves determining the volume of acid required to neutralize the oxalic acid solution, which can be used to calculate the concentration of oxalic acid.
Why is brown turbidity found in titrating KMnO4 solution with oxalic acid?
Brown turbidity in a titration of KMnO4 with oxalic acid typically arises from the formation of manganese(II) ions during the reaction. When KMnO4, which is purple, is reduced by oxalic acid, it produces manganese(II) ions, which can form a brown precipitate of manganese(IV) oxide (MnO2) in certain conditions. This turbidity indicates the presence of manganese species that are not fully soluble, often due to incomplete reduction or changes in pH during the titration.
What is the principle involved in this method of purifying oxalic acid?
The principle involved in purifying oxalic acid through recrystallization is based on the differences in solubility of impurities and oxalic acid in a specific solvent at different temperatures. By dissolving the impure oxalic acid in hot solvent and allowing it to cool, the less soluble impurities will crystallize out, leaving behind a purer oxalic acid solution.
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.
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.
Why oxalic acid is acidified before titration?
Oxalic acid is acidified before titration to provide a medium that favors the reaction of the analyte with the titrant while minimizing interference from other substances. Acidification ensures that the oxalic acid dissociates fully to its acidic form, allowing for a more accurate and precise titration.
Why oxalic acid is heated before titration with KMnO4?
Heating oxalic acid before titration with KMnO4 helps to remove any water of crystallization, making the compound anhydrous. This ensures accurate measurement of the substance being titrated and helps to prevent interference from water during the titration process. Additionally, heating can help to dissolve the oxalic acid more effectively, ensuring a more efficient reaction during titration.
What indicator can you choose for the titration of oxalic acid with sodium hydroxide?
Phenolphthalein is a suitable indicator for the titration of oxalic acid with sodium hydroxide. It changes color from colorless to pink at the endpoint of the titration when the acid has been completely neutralized.
Why heat oxalic acid before titrate with potassium permanganate?
Heating oxalic acid before titrating with potassium permanganate helps to accelerate the reaction and improve the accuracy of the titration by ensuring that the reaction proceeds quickly and completely. Heating also helps to break down any impurities or complexes that may interfere with the reaction, leading to more precise results.
Which indicator is used in titration of oxalic acid with HCl?
Both HCl and oxalic acid are acids. Therefore, since there is no alkali present, these compounds do not undergo neutralization. So there is no suitable indicators for the addition of these two reagents.
Why is phenolphthalein indicator used in the titration of oxalic acid against sodium hydroxide?
Phenolphthalein is used as an indicator in the titration of oxalic acid against sodium hydroxide because it undergoes a color change at the pH region where the reaction between oxalic acid and sodium hydroxide is neutralized. Oxalic acid is a diprotic acid, meaning it requires two equivalents of sodium hydroxide to be fully neutralized. Phenolphthalein changes color at a pH of around 8.2-10, which is ideal for indicating the endpoint of the titration.
Why potassium oxalate is acidified before titration?
If the temperature is too low (below 55 degrees celsius), the interaction between the oxalate and the potassium permanganate will move too slow as to be used as a practical lab experiment. *** Above 60 degrees celsius, oxalate acid begins to decompose, so it's important to stay in this range.
What is the Product of aluminium hydroxide oxalic acid and potassium oxalate?
The product of aluminium hydroxide and oxalic acid is aluminium oxalate, while the product of aluminium oxalate and potassium oxalate is potassium oxalate and aluminium oxalate.
Why oxalic acid is added before titration of vitamin c?
Oxalic acid is added before titration of vitamin C to ensure that any trace amounts of transition metal ions are complexed. These metal ions can interfere with the titration process, leading to inaccurate results. Oxalic acid helps to prevent this interference by forming complexes with the metal ions, allowing for a more accurate determination of the vitamin C content.
Why 2N sulphuric acid is used in oxalic acid estimation?
This titration is based on the neutralization reaction between oxalic acid and sulfuric acid; a pH indicator is used.
