Is there a way to find out the number of moles of gelatinous substances? I want to calculate the number of moles of a gelatinous substance and I don't know any way to do that.
First of all, you will have to find out the molecular weight of the gelatinous substance under consideration by more than one methods and get the quantitative values of viscosity average M. Wt., weight average M. Wt. and number average M. Wt. before proceeding ahead having and also having information on the weight of the gelatinous substance used and further calculations to know about the number of moles of the same.
In this context if the gelatinous substance is polymer then the knowledge whether it is straight chain polymer or a branched polymer would be useful to arrive at the correct value of moles of the gelatinous substance under consideration.
Dear Husham N. Noori in order to receive a larger number of answers to your interesting technical question you should provide a few more details. The term "gelatinous substances" is rather vague and unspecific. The nature of such substances can be very different. They can comprise inorganic and organic compounds, and they can be well-defined or undefined. As mentioned by Arun Padhye you can e.g. have a polymer which is gelatinous. The characterization of such a polymer requires specific methods which are established in polymer chemistry. On the other hand, the "gelatinous substance" can also be an inorganic compound. For example, when you take an aqueous solution of an aluminum salt and add a solution of NaOH, you will obtain a gelatinous white precipotate of Al(OH)3. This is a well-defined compound for which you can easily calculate the molar mass (molecular weight).
I hope this answers your question partly. Good luck with your work!
I am very sorry for not mentioning any specific details. Currently, I have no idea about the use of any specific gelatin, but before use, I need to know how to calculate their molecular weights. For example, gelatin from fish skin.
Your job is easy as far viscosity average molecular weight (Mv)determination is concerned.
Most probably fish gelatin is a straight chain molecule without any side chains/branching (please confirm the facts)and thus there shouldn't be any error when you try to apply Mark-Houwink equation.
From the Mark-Houwink equation the relationship among the molecular weight and viscosity are given below
Where «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mfenced close=¨]¨ open=¨[¨»«mi»§#951;«/mi»«/mfenced»«/math» is the intrinsic viscosity , «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»M«/mi»«/math» is Molecular weight, «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»K«/mi»«/math» and «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»§#945;«/mi»«/math» are constants for a particular polymer solvent system.
If we know the «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»K«/mi»«/math» and «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»§#945;«/mi»«/math» values for a given polymer solution the intrinsic viscosity and molecular weight can be calculate using the above equation.
Polymer-solvent system K x 103mL/g «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»§#945;«/mi»«/math»
PMMA-Acetone 7.70 0.70
PMMA-Benzene 5.20 0.76
PMMA-Toluene 7.0 0.71
Poly vinyl acetate-Acetone 10.2 0.72
Poly vinyl acetate-Benzene 56.3 0.62
Poly vinyl acetate-Acetonitrile 41.5 0.62
Poly vinyl alcohol-Water 45.3 0.64
Poly styrene-Benzene 10.6 0.735
Poly styrene-Toluene 11.0 0.725
The molecular weight of the polymer is measured by using viscometer and the molecular weight obtained by this technique is called viscosity average molecular weight. The molecular weight of the polymer solution is very high so the viscosity of polymer solution is very high compared to that of pure solvent.
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Determination of Viscosity Average Molecular Weight of Polymer
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I would request you to go through the original reference to avoide confusion.
Regards,
P. S. :
You can also find out molecular weight by molecular sieve analysis where standard with known M.Wt. compound can be run parallel alongwith sample to get reasonably accurate results.