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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 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.
Why is it important that the Fehling's solution for use as a reagent by freshly mixed?
Fehling's solution contains copper sulfate and alkaline tartrate, which can deteriorate upon prolonged exposure to air. Freshly mixed Fehling's solution ensures the copper ions are in their active state for proper oxidation reactions in detecting reducing sugars, providing accurate results. Deterioration of the solution over time can lead to false negative test results.
What happens when freshly prepared solution of ferrous sulphate followed by conc.H2SO4 is added to nitric acid?
You can obtain the ferric sulphate - Fe2(SO4)3; because the ferrous sulphate react as a reducing agent.
What kind of mixture is freshly-brewed black coffee?
Freshly-brewed black coffee is a homogeneous mixture. It consists of water as the solvent and coffee particles as the solute, which dissolve to form a uniform solution.
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.
Why you use freshly prepared ferrous sulphate solution in detection of nitrogen?
Because in FeSO4, iron present in +2 oxidation state but the stable oxidation state is +3. The Fe(II) get oxidized into Fe(III) in ferrous sulfate solution that's why preparation of solution must necessary.
Why do you need freshly prepared starch solution for iodometric titration?
because,starch undergoes a photochemical reaction. So, with the passage of time it can under go to the photochemical reaction and starch wouldnot be starch but it might have changed in anyother product. so...we should use freshly prepared starch.
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.
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 expiry date should be put on freshly prepared potassium citrate?
Freshly prepared potassium citrate solutions should typically be stored in the refrigerator and used within 24 to 48 hours for optimal stability and effectiveness. However, the exact expiry date may depend on specific formulation guidelines or institutional policies. It's important to label the solution with the preparation date and consult relevant pharmacological resources or guidelines for the most accurate expiry recommendations. Always discard any unused solution after the recommended period.
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
