Applied Chemistry

why is ammonia gas has so much bad smell, is there any mathod 2 decrease its effect?

Hello, I am trying to do some detective work to understand the cause of a failed heating element. A yellow deposit was observed and elemental analysis shows strong peaks of Cr, O, Na, and Cl. the heating element has been in water softened by ion exchange with NaCl, so that makes sense. Heating elements are often Nichrome, which forms a coating of chromate (CrO4) once heated. Does anyone know if CrO4 is stable in aqueous NaCl? Could the presence of Na and Cl ions be attacking the CrO4? 'm not sure how the chemistry of it works. There could also be an influence of galvanic action. Any help would be appreciated! Thanks

Why can you add about 20mL of water to about 5 ml of vinegar and it not have any effect on determining the concentrations when doing a titration??

So, I recently interviewed at a food & water microbiology lab, and the interviewer said several things to which I could not get an answer from him. I have a few years of biochem experience, but not micro. b]GLP[/b]. He said he ran his lab under GLP, yet he never deals with the FDA. Wouldn't he? FDA. The lab tests food for producers, restaurants etc by testing products, stability samples etc, and yet he claims he never deals with the FDA. Wouldn't he? AA. He never explained what his AA spec tests for. I'm guessing it's for heavy metals in water, right? PCR. He insinuated that PCR was used to grow bacteria, yet when I mentioned PCR for DNA amplification,…

How perfect is the best adhesive with broken glass? (imperfection approx zero) and is it possible to have a perfect restoration?

Does anybody know how Evans diagram for Fe/Cu looks like?

Image is given below, for blank (H2SO4, 5%) and for 10ppm quinone sulfate

Hi all! how could I induce gelation in ethanol. I mean to say are there some polymeric materials to do so? I need the information as I am trying to prepare the gel form of a topically applicable ethanol soluble drug. Help awaited... thanx for your time neeraj

That clear compound used to cover porcelain, pottery, yielding a very hard surface after the kiln process... What is it made of ? It is sold as a thick liquid ?

I cant seem to find a semiquantitative test for nitrates in solution when in prescence of nitrites. The only one I can find involves Hg. Any simple solutions (no pun intended)? This is for my fish tank. No need paying the fish shop for chemicals if I can do it myself.

Can anyone please tell me the substitute of acetic anhydride for the Acetylation, actually I am finding Hydroxyl Value for Ketonic Resin and it is a precursor to have Acetylating agent ready .

Hi, I'm doing an experiment where I have to analyze and determine the concentration of H2O2 in creme hair bleach. Any suggestions on what to do??? I have to actually perform the experiment, so simple, inexpensive methods would be preferrable.

Hello everybody! We are two students in a swiss high school, and we just began a chemistry project: we are working on the production of carbon nanotubes by magnetron dc sputtering method. We have been working for some months, but we still have lots of problem: the depositions are scant and we actually don't know if they are nanotubes. Our deposition on silicon platelets should show nanotubes geometry (that's the common method to identify them), but we still haven't found any of them. We use a pure graphite target. The working parameters are: Pression: 2-3 x 10^-1 Torr ΔV: 500 V Current: 40-60 mA I'm not going to post our whole work, that's only to briefly ex…

I want to make a reagent with cupric chloride. I watched a video showing placing copper in a jar, then adding hydrochloric acid and hydrogen peroxide. After stirring he ended up with a green solution, however my recipe says I need 30 grams of cupric chloride, so how do I get a solid (powder) rather than a liquid

I want to protect my bismuth oxide layer to preserve the color over time, but clear coats seem to disrupt the wave interferences. What should I try? Thanks, Ernie

Hi Science Forum friends, I'm Ashley, an independent feature film producer, director and writer. I'm making my third feature film that involves a chemical engineer turned spy who is trying to evade assassination (she's expecting to be taken out by a nerve agent). Sounds dramatic, I know - but I suppose noir psychological spy thrillers should be a bit dramatic, right? As it stands I've written some material that sees my spy collecting drugs from a pharmacy, including naloxone, to mix with an unidentified chemical compound given to her by her spy ring leader. The idea is she administers the cocktail to herself (dropping a few drops in her coffee every da…

I hope I can explain my question well enough since Im not a native speaker :) Basically I was wondering, why as in reaction to a diabetes I condition the muscle is breaking down its own protein to amino acids, which then are farther moved to the liver resulting in gluconeogenesis? It makes no sense to me because I don's see the necessity of the muscle doing so during Diabetes I. In a similiar condition such starvation I do understand the necessity, because the body actually lacks glucoses and eventually runs out of all other sources to possibly synthesise glucoses through gluconeogenesis und thus needs to resort to glucoplasmatic amino acids. However during dia…

Hi All I am currently trying to analyse Rapramycin (Sirolimus).I have a DES and I am trying to extract the Raprmycin with DMSO and analyse it on the GCMS underivatised does anyone have any experience of this analysis Thanks

Hello! Does anybody know a way to electrochemically clean a glassy carbon rotating disk electrode? I tried polishing it with Alumina powder, but I'm still not sure if it is clean enough. Any help would be appriciated. Thanks!

Given the summer time I've always wondered if there were any substances that would help in combating heat and humidity without using airconditioners and electrical appliances. I was looking at a chemical approach. Is there something I can make that is first cheap or moderately cheap that would take away (absorb) humidity? and is there any safe reaction I could do that would have a decent endothermic reaction that would effectively cool down a small room?' I think if there was I it would be well know, but I figure I would give it a shot. Any help would be cool. ( that pun is for phi)

Does hydrogen formed by electrolysis have a specific isotopic signature? With other words; does hydrogen undergo isotopic fractionation during the process?

well i was just wondering about this topic for quite some time now but couldn't make any odds out of it. just think : what and why do we have the concept of stability? commonly said an unstable substance would disintegrate or undergo some changes to attain a state of stability... like any ion or radical would react any reagent available to form some product. now just imagine that a during the course of some reaction some unreacted unstable intermediate is formed which couldn't react with anything as the other reagents are exhausted and the whole system is isolated... what would happen to it? it would exist in that unstable state forever( as long we keep it isolated) becau…

Hello, I'm new. I am running a STEM club with a group aged 8-10 years and we are hoping to this experiment from gsk https://www.gskscienceeducation.com/media/412926/Fighting_back_Lab_Infectionindd-1-.pdf#ga-track . I was looking to buy Universal Indicator but it seemed very expensive just for the sake of one session, so started to look for Phenolphthalein. However upon reading the safety sheet I was taken aback by all the warnings! I then noticed the same about the universal indicator. I would like to use a liquid rather than indicator strips as I just think the "effect" will be better. But I am concerned about safety issues so can someone please advise which i…

Hi, I'm a senior high school student doing a project on pesticides in produce and would appreciate it if someone could explain to me the general basics of Liquid Chromatography Mass Spectrometry (LC-MS) and how it can be applied to detect pesticides in produce. Thanks!

how many mills are there in a mole?