Titration to check the acidity of tomato at its different growing stages
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Acidity of fruits is due to the formation of an acid in the fruits.
In tomatoes the acidity is due to the presence of ascorbic acid and mainly oxalic acid. Generally, the inner layers of these fruits, due to the action of certain enzymes and substrates produces the acid. The acid is found in these layers.
The normality of a solution is the number of gram equivalents of the solute per liter of the solution. i.e.
Gram Equivalent = NW/Weight/No. of electrons transferred.
Gram Equivalent of KOH = 1.4
So, in solution, 1.4 grams of KOH is dissolved in 250 ml of water for 0.1N solution.
· Take the burette, rinse it with KOH and then fill it with the prepared 0.1N KOH solution.
· Pipette out 10 ml juice of the prepared tomato juice solution into the titration flask.
· Add 2 to 3 drops of phenolphthalein in the titration flask.
· Titrate it dropwise with the 0.1N KOH solution present in the burette till the solution becomes pink.
· Note the burette reading.
· The titration of the same solution was repeated again till the concordant reading was obtained.
· In the same way the other two tomato juices were titrated and concordant readings were obtained and recorded in the tabular form.
In tomatoes the acidity is due to the presence of ascorbic acid and mainly oxalic acid. Generally, the inner layers of these fruits, due to the action of certain enzymes and substrates produces the acid. The acid is found in these layers.
The normality of a solution is the number of gram equivalents of the solute per liter of the solution. i.e.
Gram Equivalent = NW/Weight/No. of electrons transferred.
Gram Equivalent of KOH = 1.4
So, in solution, 1.4 grams of KOH is dissolved in 250 ml of water for 0.1N solution.
· Take the burette, rinse it with KOH and then fill it with the prepared 0.1N KOH solution.
· Pipette out 10 ml juice of the prepared tomato juice solution into the titration flask.
· Add 2 to 3 drops of phenolphthalein in the titration flask.
· Titrate it dropwise with the 0.1N KOH solution present in the burette till the solution becomes pink.
· Note the burette reading.
· The titration of the same solution was repeated again till the concordant reading was obtained.
· In the same way the other two tomato juices were titrated and concordant readings were obtained and recorded in the tabular form.
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having 4 part IG,immature green, MG MATURE GREEN, BR,orange breaker , RR,REDRIPENING STAGE
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