- by /u/Uetuu13submitted by /u/Uetuu13 [link] [comments]
- by /u/leuskaxkWell hello fellow scientists. I need help with calculating the system potential in a titration of tin(II) ions with potassium permanganate ( in 1M sulfuric acid environment ) after the equivalence (For full context, Veq = 80ml, solution of tin(II) is 0,05M and V=100ml, thus concentration of standard solution of potassium permanganate is 0,025M). Standard potentials (E°) are 1,51 V for Mn system, 0,14 V for Sn system. Generally, the system potential would of course be : E(cathode) – E(anode), and in this case, the reduction of permanganate ions ongoes on the cathode. Following the Nernst equation and stechiometry : […]
- by /u/LoreDek94Does anyone know why the first peak goes from positive to negative? detector rid; the program is in isocratic 70:30 water:methanol, the first peak should be 6-aminohexanoic acid, the column is a c-18 reversed phase submitted by /u/LoreDek94 [link] [comments]
- by /u/aaaaddddaaaahhhhQuantitative Chemical Analysis, 10th /9th edition, by Daniel C. Harris, W. H. Freeman and Co. submitted by /u/aaaaddddaaaahhhh [link] [comments]
- by /u/TheProudCanadianSuppose I have reactants A and B that each can react with C irreversibly with different rate constants. In a series of experiments, concentration of A and C were held constant while B was varied with C being the limiting reagent. If the amount of AC formed in each experiment were plotted as a function of B's concentration you will get a data set that follows a certain decreasing trend. I have an expectation that you could derive some kinetic information from this data, but im looking for literature that could help me understand. I'd love to be able to […]
- by /u/torturers_rage_1412submitted by /u/torturers_rage_1412 [link] [comments]
- by /u/Thunder_Ashhsubmitted by /u/Thunder_Ashh [link] [comments]
- by /u/Legitimate_Crazy_159Hi, anyone knows how to measure manually split ratio on older models GC/FID? I know i want to use a sample containing unretained components like methane or air, someone suggested just to inject lighter fluid and then do math based on the dimensions of the column, but the butane evaporates so quickly that i cannot adequately inject it. Anyone has any other ideas for the sample that i can use to measure the linear flow velocity (and subsequently split ratio)? submitted by /u/Legitimate_Crazy_159 [link] [comments]
- by /u/Aggressive_Bit_8827Hi all, I don't know if these kinds of career questions are welcome here, but I'll shoot it off anyways. I'm an undergraduate considering analytical chemistry as a career. I'm taking my quantitative analysis course and am really enjoying it. In addition, I've recently gotten a lab technician job doing a lot of GC stuff and so far its going great. However, as well as chemistry, I also love math. I'd hate to never see calculus again if I go on to (try to) be an analytical chemist (either as a professor or MS/PhD-level work in industry). From my QA […]
- by /u/Ok_Routine_4938We are identifying chiral impurities through the SFC. Method is pre developed we are just validating the method, but we are facing serious issues with this method even after washing the column properly for couple of the days. Issue: 1) not proper peak for std and sample. 2) Too much noise in baseline and even in blank. 3) not consistent with results. Anybody has suggestion like how we can prepare the instruments, what things need to make sure when using SFC. submitted by /u/Ok_Routine_4938 [link] [comments]
- by /u/beavmaneI want to prepare a sample diluent for an ISE module Hello, I want to prepare a sample diluent for my ISE module to analyse Na, K and Cl in the plasma using indirect potentiometry method, but I don't have too much knowledge about chemistry and specifically buffers . I don't have the composition of the original sample diluent, I only know that it contains triethanolamine as a compound and has a pH around 7.7, density of 1.016, and I think that it has a very low ionic strength. I don't have triethanolamine, so I tried to prepare it with […]
- by /u/WaviLabHas anyone made the transition from a triple quad LCMSMS to an Orbitrap for non-targeted PFAs testing? I plan to open a PFAs testing lab in the next year. Any advice or suggestions? The number of compounds an orbitrap can test for makes it a very lucrative investment for PFAs labs. I have multiple orbitraps & will probably only use 1-2 in my lab. If anyone is in the market for an orbi, I can supply one for $40k-50k under market price. I hate these companies that rip scientists off with huge markups. submitted by /u/WaviLab [link] [comments]
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