Submission of Proposal under Star College Scheme



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Bog'liq
2.-Chemistry-Final-compilation

Usual Strength:
The equivalent of 500μg and 1 mg of anhydrous cyanocobalaminper ml.


Assay:
Carry out the following procedure protected from light
The Dilute the injection if necessary , with water to produce a solution containing not more than equivalent of 0.0025 percent w /v of anhydrous cyanocobalamin and measure the absorbance at about 361 nm. Calculate the content of C63H88 CoN14O14P taking 207 as the specific absorbance at 361 nm.


Storage:
Store protected from light in single dose or multiple dose containers.


Labelling:
The label states the strength in terms of the equivalent amount of anhydrous cyanocobalamin, in a suitable dose-volume.
Project: 1
Project: 4
Spectrophotometric study of the reaction of potassium iodide with potassium persulphate


Aim:
To determine the order and rate expression of the reaction of potassium iodide with potassium persulphate spectrophotometrically.


Theory:
The rate of a reaction can be followed spectrophotometrically if one of the reactants or products absorbs light strongly and distinctly from the other reactants and products. The rate of the reaction is represented by the slope of the line in a graph of absorbance vs. time. A reaction is first order if an increase in concentration produces the same increase in rate, that is, if doubling the concentration of a reactant doubles the rate, the reaction is first order in that reactant. If doubling the concentration of a reactant causes a four fold increase in the rate, then the reaction is second order in that reactant. If doubling the concentration causes an eight fold increase in rate, then the reaction is third order in that reactant.
In the reaction between KI and K2S2O8, the triiodide produces a yellow solution that absorbs light in the 350 nm region. The reaction is as follows:


Thus, the absorbance increases as more of the triiodide ion is produced. From the graph of absorbance versus time, the slope of the line for a reaction is the rate of that reaction.





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