So you add the base and it moves quickly to the sites well exposed to the solution and somewhat slower into spaces that could be described as having a more tortuous path How would you reconcile that with a titration procedure that occurs over a much shorter time frame? From NaHCO3 titration there are 1. Posted Jun 24, Boehm titration is an acid-base titration method which is used to determine the amount of surface oxygen groups acidic or basic present on carbon surfaces activated carbon, carbon black, graphene, carbon nanotubes, etc. Why is this water turning black during electrolysis? But anyway as you write yourself hydroxide titrates all acid groups, hydrogen carbonate only the most acidic ones. 
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This is to allow enough time for the surface tittration to get neutralized and from my experience to ensure that there is a measurable amount of titrant required to achieve the endpoint when doing the titrations.
Evaluation of modified boehm titration methods for use with biochars.
Replies 5 Views In total there are 6 users online:: How would you reconcile that with a titration procedure that occurs over a much shorter time frame? Is it necessary to subtract this from the initial number of moles of NaOH solution before adding carbon?
Related Chemistry News on Phys. Boehm Titration - Carbon surface group characterization.
Evaluation of modified boehm titration methods for use with biochars.
Replies 5 Activafed 4K. Started by A M Aug 14, Replies: From NaHCO3 titration there are 1. Why is this water turning black during electrolysis?
Maybe someone can help ritration workout the calculations and if the science checks out, this is what I've gotten so far: It does not make sense that you get the highest result with hydrogen carbonate. No registered users and 6 guests. What were you doing with the back titration? Separation Science offers free learning from the experts covering methods, applications, webinars, eSeminars, videos, tutorials for users of liquid chromatography, gas chromatography, mass spectrometry, sample preparation and related analytical techniques.
Remember that carbon black is the carbonized remains of once living tissues composed of tiny individual cells. If a shorter period of time is metod I would assume using a lower amount of carbon maybe 50 mg I've used 1.
Hot Threads Naturally Occurring Elements: Posted Jan 18, Posted Jun 19, Have you noticed the lengthy naoh soak for this procedure? I'm trying to analyze the surface oxygen functional groups on activated carbon using the Boehm titration method but I've been having problems due to differences nethod in literature. How much base remains caught up in those less accessable spaces?
Subscribe to our eNewsletter with daily, weekly or monthly updates: Replies 1 Views 3K. Typically the time allowed for the carbon to remain in contact with the solutions is 24 hours and the maximum I've read is 72 hours. So from the results there are 1.
My main concerns are: For a better experience, please enable JavaScript in your browser before proceeding. I haven't read the procedures you have access to so I may misunderstand what you refer to as back titration.
Otherwise something went wrong.
All this is controlled by diffusion so it is reasonable that it takes some time Markus Laeubli, Metrohm Posts: Posted Mar 1, What is the Boehm Back Titration end point?
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