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Why do you have to heat up the solution of oxalic acid after adding sulphuric acid for the titration with permanganate?
Wiki User
∙ 11y ago
To act as a catalyst
Wiki User
∙ 11y ago
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What is the effect of adding the sulfuric acid before KI in iodometric titration?
Sulphuric acid helps in maintaining pH around 3-4 which further helps in liberation of iodine upon adding KI solution.
Is dilute sulphuric acid compound?
Dilute sulphuric acid is an aqueous solution, formed by adding water to sulphuric acid, resulting in a homogeneous mixture.
What is A method to determine the concentration of a substance in solution by adding a solution of known volume and concentration until the reaction is done?
The answer to my own question is: TITRATION
Why does the color of potassium permanganate not disappear when excess of ethanol is added to it?
KMnO4 is pink in a solution without oxidizing reagents. Adding ethanol should change it to a brown solution. If adding ethanol can not change the solution to brown, then its environment is already acidic and will not reduce.
What is The process of adding a known amount of solution of known concentration to determine the concentration of another solution is called?
titration is the best method to determine the unknown concentration of the unknown. if ur known is a solid then you would have to used distilled water to ensure it is submerged before you titrate.
Why there is a need to warm the solution of sulfuric acid and oxalic acid during redox titration?
Adding heat to a reaction usually speeds up a reaction.
What is the type of test used to show color changes of certain water solutions?
adding what is called an indicator such as phenolphthalein which is colorless in an acidic solution, but turns pink in an acid solution often used in a test called titration
What is the operation principle of a titration?
A solution containing an element to be determined (the concentration being unknown) is titrated (adding a reagent - the titrant) with a standard solution (with a known concentration); knowing the volume of the titrant and the reaction which occur the concentration of the analyte is calculated. Titration is manual (also called volumetry) or potentiometric and is a very common method in analytical chemistry.,
How do you separate ppt of lead sulphate obtained by adding sulphuric acid to a solution of lead nitrate?
Usually by filtration; centrifugation would also work, but can not obtain as thorough a separation as filtration.
Why is indicator added to a pipette solution before titration?
I'm not sure what you really mean. There wouldn't be any point adding it afterwards! It's there to reveal the end point of your titration. You could add it when you thought you were near the end point, but it's easier to put it in before you start.
Why do you use sulfuric acid in the standardisation of potassium permanganate?
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
What is titration used in the medicine industry?
Medicine is uses to reduce a patient until they are heal. In particularly in chemistry is it the process of finding a concentration of a certain reactants in solutions. This functionality, titration is also known as volumetric analysis, due to a heavy reliance on the measurement of volume and concentration. Titration involves taking an agent of unknown concentration and adding it to a solution. The agent is often known as the titrant and the purpose of adding it o a solution is to create a measurable reaction with the unknown agent. The scientists have to find the exact concentration of unknown agent, also known as the analyte. The concentration of the analyte will not found until the reaction has finished. Often the solution that will change colour to give and assessable endpoint to the reaction.
