Is it possible to get yield of a chemical product more than 100%...? If so, how one can defend this situation? I am working on Condensation reactions using organic solvent free synthesis. For some reactants, I am getting more than 100% yield. Kindly let me know if any researcher or professor faced this type of observations during their experience.
It is impossible to get more than 100% product. It doesn't mean that there is no impurities, byproducts, salts that aren't seen in NMR. Some compounds absorb water really easily so if you keep them out of exicator for any length of tim, they can soak up a lot. And there's classic "not the product you're looking for" scenario.
Impossible to get a yield more than 100% . If this happen this mean you may have some impurities in your product and you should purify it
It is absolutely impossible.
If you use an excess amount of the reactant, may be your product still contains the unreacted reactant. Some products could adsorb water or other used solvent during separation and purification process.
Hello there!
I would say that it is impossible. If you calculated and got the yield more than 100%, please check the NMR results, or simply from TLC (HPLC, GC..).
Several possible reasons are listed below:
1). Containing starting materials (especially in solvent-free reactions)
2). Byproducts (self-disintegrated products, oxidation products while conducted the reaction in air...)
3). Other impurities (contaminated starting materials, reaction vessels...)
Basically, I think maybe some actions to rule out any possibility need to be taken in this case, my friend. :)
Hoping this will be helpful,
Kevin
Theoretically impossible, while experimental value might be higher than 100% for several reasons. Typical experimental errors might be up to 10%, and you may have the experimentally determined yield up to 110%. Other reasons are already listed in the previous answers. It's also very important how you define "the yield" and how do you measure it.
The maximum or theoretical yield is based on the limiting reactant and cannot exceed 100%. In many cases, when a reaction is worked up, inefficiencies in removing unreacted starting materials, unanticipated side products, inorganics, solvents and moisture might lead to the appearance of "yields" in excess of 100%. Gas chromatography can disclose organic solvents, unreacted starting materials and side products. NMR spectral analyses can reveal the presence of water and solvents.
In fact, it depends on how we define a physical quantity. The value of biomass to substate yield is less than one but the substrate to biomass yield is greater than one. Both quantities are used and the second one is the reciprocal of the first. Regards,
In the meat industry, when producing meat products, the yield counts in relation to the mass of the used meat. The yield can be 100% or even 1000%. There are such products and there are many such situations in the food industry. Returning to the question, if the yield refers to all consumed raw materials, it can not be more than 100%. Regards,
In chemical syntheses, including polymerization reactions, an yield of more than 100% can primarily mean the involvement in the reaction of uncontrolled components: solvent, oxygen, carbon dioxide, water... Regards, VZ
No it's not possible to get more than 100% yield. The yield must be calculated on the basis of reacting components [substrate, reagent, solvent or gas (if it take part in the reaction to form the product)] and the molecular formula/ moles of product formed.
Some answers are not in agreement with Lavoisier low, fondator of the recent chemistry
In any case the theoretical nor experimental reaction yield can be more than 100 percent
Even in the case of the use of reactant excces the yield should be calculated on the relatively to the limiting reactant after elimination of the excess
not possible , you check some method , first you will check the TLC, your compound pure are not you clearly you will see. your compound liquid means you can use extra time rota evaparator and use the high vacum pump ,because solvent remove this kinds of method good.
Above all, the law of mass conservation and definitions, but as I wrote above are industry exceptions. This discussion does not lead to anything. Regards,
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