Applied Chemistry

Let's say i have a problem with my NMR machine. I only know that that there is no spectrum, one think that is given to my information is that the tuning/matching (wobb) is working and signal is received. What where your first thoughs on what is wrong, what to do in the next? My thoughs: Magnetic field drift: If the magnetic field drifts away from the resonance frequency of the sample, the NMR signal may be lost. This can happen due to changes in temperature or other environmental factors. Shimming problems: Shimming is the process of optimizing the homogeneity of the magnetic field. If the shims are not properly adjusted, it can cause signal loss or distor…

Can anyone help me calculate the Gibbs free reaction energy in a Lithium Iron Phosphate battery with the combined equation? LiC6 + FePO4 → C6 + LiFePO4 Since the Lithium ions are acting as intermediaries and are on both sides, I understand that they can be removed from the equation. Since the formation energies of all these molecules are not listed in any tables I can find, I presume I have to work from the components of each molecule, so using the Gibbs formation energies of Li+, C6, Fe+, Fe2+ and PO43-, before I can use the combined equation above? For example to get the ΔG°f (FePO4) do I use the equation: Fe3+ + PO43- → FePO4 and then…

I'm having trouble finding in the literature specifically about the porous silicon process using the dry method instead of the more common wet method that is used. wet process Using porous silicon to promote wet thermal oxidation uses the process electrochemically will allow water molecules to diffuse into it. Wet oxide is often used for oxide growth. So that the structure (cavities) does not collapse after using the previously mentioned process or remove that PENTAN. Example: See the photo in attachment 01 dry process If it refers to the dry process, I can't find anything profound in the literature, it just cites the case. I would need to understand how this…

Hi, Does anybody know how would BDDE (1,4-Butanediol diglycidyl ether) decomposed at high temperatures? (boiling point is 266°C). I will mix small amount of BDDE with powder of CaCO3 and hit it up to 255°C. Should I expect that all of BDDE will decomposed? Tnx

Is it possible for a coal plant to pipe some of it's exhaust into a greenhouse-like structure filled with worthless mineral deficient dirt and infuse it with carbon to the point it turns into valuable soil capable of growing food with? Or if the greenhouse-like structure was filled with fast growing trees, as part of a for-profit tree farm, would this aid, stunt or be neutral to their growth?

I work in industry water chemistry. I am trying to figure out how effectively build a chart that would indicate the pH of water with phenol red using the absorbance value at 560nm wavelength. I know the concentration of phenol red matters and it will change the absorbance of the pH. So let's assume I am using 5ml of phenol red and 45ml of water. I can figure out concentration later. How would I even test the method? How would I find an exact pH of 7, 7.1, 7.2, 7.3..... etc. to even be able to figure out the absorbance? I essentially want a chart that when I test 10 ml of water and test it on a Hach DR900 under the 560 wavelength I can read the meter output…

I recall a while back now that between them both MIT and Harvard were working on coatings to create a frictionless surface, most notably demonstrated by extracting the last of the ketchup in a bottle: Since 2012 nothing much has come of it. However, predating that back in 2009 there has been continuous experimentation with using a femtolaser to etch into materials to give them hydrophobic properties, so that no new material need be added : http://www.rochester.edu/news/show.php?id=3387 I would like to know, for example in an aluminium food can, if any of the metal were to chip away, would that be safe to imbibe or ingest ? Rusted metal wil…

I have a PCB with a CR2032 battery inserted into the PCB and this PCB is stored after many years in storage and the CR2032 charge goes to 0% will this battery go into chemical enhancement to generate an oxidative corrosive compound and will leak from the battery corroding the PCB?

Good day. Typical image from the web on automotive battery. Cleaning with wet hot baking soda is effective, the something-impregnated felt disks work well, What household product is also effective to keep the corrosion away ?

what are the names of 2 solids that combust when they come into contact or repel away from each other violently

Lactic acid is hard to extract from fermentation broth (currently the process goes: precipitate calcium lactate, regenerate with sulphuric acid- uses up a lot of chemichals, leaves a lot of waste)- so I am left wondering: why not use membrane electrolysis? calcium lactate is insoluble in cold water, but reasonably soluble in hot- or in methanol; either way, once a salt is dissolved regenerating the acid out of it ought not to be harder than putting two electrodes in with a semi-permeable membrane between them: calcium would precipitate as Ca(OH)2, which could be reused; in the anode compartment, lactic acid could be harvested and used for bioplastics etc. the pu…

https://www.nobelprize.org/prizes/chemistry/2022/summary/

I am buying a tool that has two options to power - rechargeable battery or dry cell. Personally I prefer rechargeable battery but it is not a tool that will be used so often - probably only used once every year. Does a rechargeable battery that is seldom charged and discharged last much longer than one that is charged and discharged daily? Or will it just degrade at more or less the same speed no matter what?

Hi. I know peanuts about this; that is why am here. Is there test strips that show if it is ethanol, or methanol, or some other compounds when distilling alcohols ? What sorts of identifications/concentrations are test strips made for ? pH and nothing else ? What about salinity ? Glucose ? ...?

Hello, I am currently reseaching the uses of vacuum pumps in labs, different types of vacuum pumps used in labs and their applications. If there is anyone that works in these environments please reach out as your information will help me out immensley.

Good day. A spring of stainless steel appearance is attracted to a magnet. As there is diamagnetic and paramagnetic stainless steels, I would like to find out. Half submerged in salt water for a day now; am supposed to see if corrodes. What is a way to find what metal is it made of ? The manufacturer did not want to reveal when asked. 😒

Apparently, for every unit of energy extracted from a battery, it must be charged with 1.5 units ? Thus, battery charging equates to around 75% efficiency ?

Hi everyone, I am looking for a bit of help with a chemistry question. I am doing a lot of metallographic etching (weld cross sections) and are currently using two different diluted acids: 1. For steel metallographic samples - 10% ammonium persulfate in water 2. For aluminum metallographic samples - 10% NaOH in water Both liquids are very thin (low viscosity) and run off the samples so I have to constantly reapply the acid. I would like to make them thicker (e.g. paint or gel viscosity level). I was thinking of using some off the shelf water thickeners like gelatin. However, I do not know if this will create any unexpected reactions. I do not remember …

I want to dissolve either 3 or 4g of citric acid in 100 or 200 ml of water. Now, I'm totally illiterate when it comes to chemistry, so I'm wondering, is there something in particular I need to do beyond just dumping the citric acid into a container of water? Will it just dissolve at room temperature in tap water? Also, how long will it take for it to dissolve, is it instant or do I need to wait a period of time?

Greetings. A couple of sewing needles or pins pressing onto lead solder blobs can provide decent contact to recharge a lithium cell. No mysteries there. If the contraption will be used under sea water after recharged, and some sort of gel covers the contact blobs; discharging and corrosion could be avoided. What product can allow piercing to reach contact and when pins are retracted, be a decent insulating closure ? Am thinking of something like a silicone sealer that never cures, and does not dissolve in water... What would you suggest ? Electrical source-----------------> gel solder blob

Hello, Can you please help me with calculation of percentage of water absorption by hygroscopic powder. If material increase water content by 0.36% in 5h with 23% average air moisture, by how much water content will increase in same time but with 80% average air moisture. Thanks for all the help

Why the negative ion: OH- goes from the positive electrode to the negative electrode in the process of using the Alkaline battery ? t ion: OH- is negatively charged and so is the negative electrode; so they should repel each other. thank you very much ion: OH- is negatively charged and so is the negative electrode; so they should repel each other. thank you very much

How to choose indiacator here for these above mentioned Acids titation? Is the below-given chemical compound structure of 4- nitrophenol same as given in the above question?

Hi - Looking for some help identifying a chemical compound that I use in one of my manufacturing processes. The compound in question is supplied by the OEM of my equipment and is part of an adhesion promotor for printing directly onto glass. It's one of three parts in the end solution that's used. I tried looking at the Safety Data Sheet to see what it is but there isn't any CAS number or description as it lists the substance as non-harmful. I'm trying to source alternative supplies, but not being able to identify this compound is making that difficult. The three parts in the end solution are Distilled Water (92%) Part A - liquid (2%) - this is t…

Good day. Somewhere read that elements can be extracted from seawater by - Adsorption by amidoxime-based polymers -- what is that and where to source such ? - Electro chemical cells --- What determines ignoring/rejecting sodium and chlorine ions from the process and collect only other than those ? Any 'special' voltage to ignore Cl and Na ions ?