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Freshly prepared starch solution is used in iodometric titration as an indicator to detect the endpoint of the titration. Starch forms a complex with iodine that leads to the formation of a blue-black color, indicating that all the iodine has been consumed in the reaction. Using a freshly prepared starch solution ensures the accuracy of the endpoint detection, as older solutions may have degraded and produce unreliable results.
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Why FeSO4 solution is freshly prepared?
FeSO4 solution is typically prepared freshly because iron (II) ions are prone to oxidation in aqueous solutions, leading to the formation of insoluble Fe(OH)2 or Fe(OH)3 precipitates. This oxidation can result in inaccurate concentration measurements and affect the experimental results. Therefore, freshly prepared FeSO4 solutions ensure the stability and reliability of the solution for experimental purposes.
Why starch indicator should be prepared freshly?
To prepare 1% starch indicator weigh 1g of starch powder.Measure 100ml of water and keep it for heating.by using some of 100ml water taken,make a paste of starch in watchglass and mix this paste with little and continuous strring of water which is kept for heating.when all the paste is added,allow for heating 5more minutes then starch indicator is ready for titration.Note:no lumps of starch should present in water
Why should only freshly prepared solution of ferrous sulphate solution be used?
Freshly prepared solution of ferrous sulfate should be used because it is prone to oxidation when exposed to air, leading to the formation of ferric ions. This can result in inaccurate test results due to the presence of ferric ions instead of ferrous ions. Additionally, solutions that have been stored for extended periods of time may also be contaminated with impurities, affecting their effectiveness.
What is the pH of urea?
The pH of a freshly prepared solution of urea is around 7, which is considered neutral. However, urea can hydrolyze over time to form ammonia and carbon dioxide, which can increase the pH of the solution.
Why is sodium nitroprusside freshly prepared?
Sodium nitroprusside is light-sensitive and can decompose over time, leading to a loss of potency. Freshly preparing the solution ensures that it is at its maximum effectiveness and concentration for use in medical treatments, particularly in managing acute hypertension or heart failure.
Why is it important that fehlings solution be freshly prepared?
Fehling's solution contains copper sulfate and potassium tartrate which can oxidize and degrade over time, leading to inaccurate results. Freshly prepared Fehling's solution ensures the reagents are at their optimal concentrations for reliable testing of reducing sugars.
Why FeSO4 solution is freshly prepared?
FeSO4 solution is typically prepared freshly because iron (II) ions are prone to oxidation in aqueous solutions, leading to the formation of insoluble Fe(OH)2 or Fe(OH)3 precipitates. This oxidation can result in inaccurate concentration measurements and affect the experimental results. Therefore, freshly prepared FeSO4 solutions ensure the stability and reliability of the solution for experimental purposes.
Why sodium thiosulphate solution is prepared in freshly boiled and cooled water?
Sodium thiosulfate solution is prepared in freshly boiled and cooled water to remove any dissolved gases or impurities that could interfere with its chemical reactions. Using boiled water helps ensure a clean solution for accurate results when used in reactions, such as in titrations or photochemical processes.
What colored coating is formed on adding zinc granules to freshly prepared ferrous sulphate solution?
A red-brown colored coating is formed on adding zinc granules to freshly prepared ferrous sulphate solution. This is due to the oxidation of ferrous ions in the solution to ferric ions, which results in the formation of ferric oxide/hydroxide on the surface of the zinc granules.
Why starch indicator should be prepared freshly?
To prepare 1% starch indicator weigh 1g of starch powder.Measure 100ml of water and keep it for heating.by using some of 100ml water taken,make a paste of starch in watchglass and mix this paste with little and continuous strring of water which is kept for heating.when all the paste is added,allow for heating 5more minutes then starch indicator is ready for titration.Note:no lumps of starch should present in water
Why you use freshly prepared ferrous sulphate solution in detection of nitrogen?
Freshly prepared ferrous sulfate solution is used in the detection of nitrate ions because it is sensitive to the presence of nitrate ions. When nitrate ions are present, they react with the ferrous sulfate solution to form a brown ring at the junction of the two layers, indicating the presence of nitrate ions. The use of freshly prepared solution is important to ensure the accuracy and sensitivity of the test, as older solutions may have degraded and may not produce accurate results.
Is starch solution transparent?
Yes, starch solution is typically transparent when it is freshly prepared. However, when heated or exposed to certain conditions, it can change to a translucent or opaque appearance due to gelatinization or retrogradation.
Why should only freshly prepared solution of ferrous sulphate solution be used?
Freshly prepared solution of ferrous sulfate should be used because it is prone to oxidation when exposed to air, leading to the formation of ferric ions. This can result in inaccurate test results due to the presence of ferric ions instead of ferrous ions. Additionally, solutions that have been stored for extended periods of time may also be contaminated with impurities, affecting their effectiveness.
What is the pH of urea?
The pH of a freshly prepared solution of urea is around 7, which is considered neutral. However, urea can hydrolyze over time to form ammonia and carbon dioxide, which can increase the pH of the solution.
Why is sodium nitroprusside freshly prepared?
Sodium nitroprusside is light-sensitive and can decompose over time, leading to a loss of potency. Freshly preparing the solution ensures that it is at its maximum effectiveness and concentration for use in medical treatments, particularly in managing acute hypertension or heart failure.
Why should benzidine reagent be freshly prepared?
Benzidine reagent should be freshly prepared to ensure accuracy and reliability of the results. It is prone to oxidation and degradation over time, which can lead to false positive or negative test outcomes. Freshly prepared benzidine reagent will provide the most accurate and consistent results in tests.
Is freshly grapefruit juice a solution or a mechanical mixture?
no
