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- Explain the principle of Polarography?
1194 Views
- Explain the role of supporting electrolyte in Polarography?
1096 Views
- How the mixture of metallic ions can be analyzed by Polarography?
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- State the applications and Limitations of Polarography?
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- How can you have quantitative analysis by standard addition method?
915 Views
By Sunil Bhardwaj
1038 Views
Rotating platinum micro electrode have following advantages over Dropping mercury electrode (DME)
1. The electrode is simple to construct.
2. The rotating platinum micro electrode can be used at positive potential upto +0.9 volt whereas DME is working in pot. range of -2 volt to +0.4 volt. Therefore scope is very wide
3. The diffusion current (which is proportional to the concentration of ions reduced at the cathode) is 20 times larger than in the case of DME. The large current obtained allows small concentration of metal ions to be measured with greater accuracy. Hence the use of rotating platinum micro electrode makes the amperometric method more sensitive and accurate.
The addition of the titrant instalments, dilutes the experimental solution to a certain extent. Due to the dilution of the solution the observed current is smaller. Hence the observed current is multiplied by the correction factor,$$ \text {Correction Factor} = \frac { V+v }{ V } $$Where, V = Volume of the original solution
v = Volume of instalment of titrant.
To minimise the effect of dilution the titrant should be at least 20 times more concentrated than the solution being titrated. As the volume of the titrant added is small therefore micro burette is used to ensure correct addition.
The diffusion current values are found after each addition of the titrant. The graph is plotted. Id V/S Volume of the titrant. From the graph, the end point of the titration and subsequently the concentration of the reducible species present in the solution can be found out by using, $$ N_1 \times V_1 = N_2 \times V_2 $$
- Explain the nature of Amperometric titration curves
1029 Views
- Advantages, Disadvantages and Applications of Amperometric Technique?
3507 Views
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Prof. Gianfranco Coletti
Shared publicly - 2019-08-23 00:00:00
Don’t want your columns to simply stack in some grid tiers? Use a combination of different classes for each tier as needed. See the example below for a better idea of how it all works.
Prof. Maheshwar Sharon
Shared publicly - 2019-08-24 00:00:00
For grids that are the same from the smallest of devices to the largest, use the .col and .col-* classes. Specify a numbered class when you need a particularly sized column; otherwise, feel free to stick to
sunil
Shared publicly - 2023-02-28 11:09:52
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ss
Shared publicly - 2023-02-28 10:48:10
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