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Why do you need freshly prepared starch solution for iodometric titration?
Wiki User
∙ 15y ago
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.
Wiki User
∙ 15y ago
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Why should only freshly prepared solution of ferrous sulphate solution be used?
baking soda
How do you overcome the disadvantages of starch indicator?
All the alpha amylase molecules should rupture . Boil water and then add to the boiling water required starch. Make sure that the starch is alpha and not beta amylase. Use freshly prepared starch solution for iodometric titrations. --unnikrishnan
Why FeSO4 solution is freshly prepared?
Solid FeSO4 easily absorb water.
How would you stir a solution freshly prepared in a volumetric flask?
You swirl the liquids in volumetric flasks to mix them.
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 is it important that fehlings solution be freshly prepared?
Fehling's solution must be freshly prepared because there is a tendency for it to oxidize if not used right away
Why should only freshly prepared solution of ferrous sulphate solution be used?
baking soda
How do you overcome the disadvantages of starch indicator?
All the alpha amylase molecules should rupture . Boil water and then add to the boiling water required starch. Make sure that the starch is alpha and not beta amylase. Use freshly prepared starch solution for iodometric titrations. --unnikrishnan
Why FeSO4 solution is freshly prepared?
Solid FeSO4 easily absorb water.
Why sodium thiosulphate solution is prepared in freshly boiled and cooled water?
why sodium thiosulfate to be prepared in hot water only
How would you stir a solution freshly prepared in a volumetric flask?
You swirl the liquids in volumetric flasks to mix them.
What colored coating is formed on adding zinc granules to freshly prepared ferrous sulphate solution?
A grayish coating is formed.
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 benzidine reagent be freshly prepared?
Benzidine reagent is used to test blood in urine. It needs to be freshly prepared in order to obtain best results, otherwise, possible contamination may occur.
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 freshly prepared 'KOH' solution is taken in a watch-glass and kept in the bell jar during the experiment to show that carbon-dioxide is essential for photosynthesis?
It is because 'KOH' solution helps to absorb all the carbon dioxide present in the bell jar.
Is freshly grapefruit juice a solution or a mechanical mixture?
no
