The discussion revolves around calculating the concentration of starch in a solution that includes ethylene glycol and water. Participants explore the implications of adding ethylene glycol on the concentration calculations and consider the effects of water content in the starch itself.
Participants generally agree on the method for calculating weight percentage based on total weight. However, there is some disagreement regarding the implications of adding ethylene glycol and how to account for water content in the starch.
Participants mention the importance of distinguishing between "dry basis" and total weight in concentration calculations, indicating potential confusion in how to handle the water content in starch.
3.043 wt%.Cyrus the great said:What is the final concentraion of my starch?
Be careful using the word "volume" unless you really mean it. Keeping it on a weight basis is foolproof. Volumes can combine in unknown ways.Cyrus the great said:So for the final volume of the solution we need to sum up everything we added in the solution (starch, ethylen glycol + water). Then divide amount of starch to the total volume (starch+ethylen glycol+water).Am i right? I got confused because It thought presense of ethylen glycol would interfer the concentration of starch and we will not get 3.043 wt %.
Nope; your method of getting wt% is correct.Cyrus the great said:So my question is if adding the ethylen glycol would interfere with the concentration of starch?
Nope; as long as it is all on a weight basis, there is no density effect.Cyrus the great said:Is density of ethylen glycol effect the concentration of starch?
Yes, wt% is 3% "dry basis." My experience in the starch handling industries is that "dry basis" or "dry solids basis" is used to prevent any confusion.Cyrus the great said:So my question is now the concentration wt % of starch is 7.77/230=3.37 % or we should consider 7/230=3 %?