Can someone explain how to come to this conclusion? I feel like im making this harder than it is.:(

Need people with a science background, Urgentlty. Thank you in advance! I need to Stop my dog from ingesting cocaine in the apartment I moved into.(YES SINCE THIS STARTED I HAVE TAKEN HIM TO THE VET MULTIPLE TIMES) I need to destroy the cocaine molecule or get rid of it effects. Its a relatively large area with multiple types of surfaces (Fabric, Wood, Tile, ETC.). My dog has started eating it and it is all over this entire Apartment. I cant move for at least a week and hes been to the vent twice already. its tiny little chunks of it. i tried to wash it away but then he just licks to the floor or finds it. I dont give a shit if it can be detected by police or anything like that.

We are confused on why the equation listed on this website is not working. In this equation the higher the amount of titrant, the higher the concentration. Which is obviously not true. Is there an equation that could give us the amount of vitamin C in the orange juice?

(The image is the equation)

I kept using ice table and got around .45 molar concentration for HI at equilibrium. At initial the reaction did not even start so there should be no product?

Hi! I'm writing a lab report for my experiment with using vegetable oil for making biodiesel using acid catalyzed transesterification. My problem is I have to calculate percent recovery, but the mass of the vegetable oil used (8.5 g) is lower than the biodiesel product (~10 g). Can anyone tell me why that might have happened?

Quick foreward: despite all logical instinct that resources for the following issue should exist, they don't. I called the CDC, poison control, local health board and EPA. Their collective response, "Get Fucked."

Quick background: a dangerous sociopath (unknown at the time) threw my things in a storage unit illegally. After spending some time there, my eyes started to burn and I experienced neurological symptoms. I would describe what happened next as, "Falling into hell." Dysphagia, ptosis, a few other nasty things. The business itself does not care at all, and the incident pretty seriously affected my mental health and body for months.

Quick ask Part 1: The only way to figure out what happened is hire an environmental hygienist for potentially tens of thousands of dollars. What's worse, the person who threw my things in the storage unit was a bit... "poisony" prior to the conclusion of our relationship. IE, someone who hurt this person terribly suddenly died and she would walk around delighting in it.

Quick addendum: Yes, I reported this to multiple authorities. Their response? As above, so below. "Get fucked."

Quick ask Part 2: Are there some quick and simple chemistry tests, DIY methods, or procedures for testing an environment for arsenic-trioxide, toxic phosphate-based fertilizers/pesticides, residual chemicals left over from the unit being a meth lab, or other commonly known poisons for vermin... or the unfortunate roommate?

Quick comment to malignant herein: Yeah, I know it absurd in theory. I strongly recommend not accidentally befriending someone who's entire life's purpose is to hide the intention of extracting pleasure from hurting other human beings. If you know how to test for that, I would likewise love to hear about how. Actually... I now know how to do that. Message me if your struggling, its about as bad of an experience as a human go through.

Seriously, massive thank you to anyone who engages with this seriously and oh hell yes I will keep you updated.

edit: forgot an agency i called pointed out by Mr_DnD

If I’m not mistaken, we see the opposite happen in a buffer solution: a strong base is added and the weak acid now donates a proton in the presence of the strong base OH-. Is the same true for the opposite? I.e. will a weak base accept a proton in the presence of a strong acid?

I've heard nitric acid, especially concentrated, is pretty nasty, however I've also heard really varying comments about NO2 which is just as important to know when working with nitric acid.

I've heard anything from "You can literally just work with it outdoors and you'll be 100% fine" to "Beware, for it is instant death" and I'm sure reality is closer to the former, but I wouldn't know how bad it really is. Also, what about nitric acid in reality? I'd love to hear about this from someone who has more experience.

Note: I'm not going to solely rely on the information provided as my basis for how i handle these substances, I'd just like to get the opinions of as many people as possible.

I am having trouble answering the third question. I cheated and looked at the answers but I am still confused. Any help would be much appreciated.

I found that the pH of prime is at about 3.3 (https://www.tiktok.com/@hammaslaakarimikko/video/7239322308190506266; source is in finnish) and that human teeth don't tolerate anything below 5.5 pH. As baking soda is a base I'd like to know the amount in gramsof it I need to get prime from pH 3.3 to about 6.5.

I understand that [H_3O^+]=10^{-pH} and I get that the oxonium ion concentration is about 0.5 mM. I believe I need the hydroxide concentration (trivial to calculate using K_w) but i cant make the jump from that in to the citric acid concentration.

What i don't understand is how the three possibly four hydrogen atoms, meaning the tribacity to get from hydroxide conc. to citric acid conc.

As baking soda is a salt it also worries me that I'm not sure if and how the (negative) Natrium ions affect the pH.

I feel like when reading my chemistry book that i am trying to apply this somehow in the wrong direction. Also the fact that I don't necessarily want to neutralize it all the way adds complexity that I am uncomfortable with. Thanks in advance for any and all help.

for 2H20 is the molar mass 2(21+116) or is it 21+1*16

Hi, I'm a pharmacy student and as a part of our medicinal chemistry course we have to investigate why the carboxylic acid bonded to the pyrrolidine has a lower pKa than "usual". Enalaprilat has two carboxylic acids, the one "closer" to the bencene that has a pKa of 2,3 (which is lower than the 4 expected for a carboxylic acid, but thats because the conjugated base of the carboxylic acid forms a cycle with the hydrogene from the nitrogen next to it) but, the other carboxylic acid has a pKa of 3,4 and I don't really know what makes it to be lower than 4, why is it more acid than usual?? theres no more resonance structures, and as far as I know nothing is giving it electronic density. If someone could help me understand would be awesome, thanks (also if the post should not be here, l'Il delete it)

https://preview.redd.it/5qkzpkzmncpc1.png?width=1200&format=png&auto=webp&s=661b5dbd79ef4193dd5f7b5abc4f514cb910a430

Title!
I'm not sure where to go. I know the orbital should be 3px because ml = -1 corresponds with x and n=3, so it should be 3. And then p because l = 1

https://preview.redd.it/o6zw198kccpc1.png?width=948&format=png&auto=webp&s=7344d560c73623be47d205db0e1799f9465b6f35

If we have a weak acid buffer, and we add a strong base, it gets neutralized by the weak acid. I was under the impression that the added OH- decreases the H+ concentration and then (by le chatelier) the acid ionization reaction shifts right to fill in the missing H+. My teacher said this is wrong, and instead the weak acid reacts with the OH-. I don’t get why this is? Why is the weak acid suddenly willing to give up its proton to neutralize the added OH- (because, by definition, a weak acid isn’t willing to give up its proton).

Im struggling for real, I struggled unreasonably so with the strong-strong calculations but this is kicking my butt. I attached the info, i just want an example on how to do this or even a hint because i am stupidly lost with this stuff

Hello everyone!

I was wondering if there's any genius chemists out there that are able to help me with my chemistry practice exam for Organic Chemistry II. I am seeking for answers and steps on how to solve the problem. The problems include of Diels Ander, Synthesis, Electro Aromatic Substution, and Aromacity. Please message me or even comment so I can message you. I am in desperate need of help!

I have a spectroscopy paper this semester and I have some questions about the standard addition method. Today we had a lab practical where we used it to measure the abs of potassium permanganate at an unknown concentration. We made standards at 10-50ppm as well as a range of 5 10mL aliquot KMnO4 at 0-40ppm also containing 1mL of the unknown sample.

My question is how is this more useful/easier than just measuring the sample against the standards? It seems pretty wasteful and I don't understand the point of it.

Please ignore username I made it when I was young and immature

Okay guys I am currently sophomore high school student and I think my Honors Chem grade is ruining my chances of getting into a good school. I have had all honors and AP courses and all As (except one B in Precalc), but my Chem teacher is ass at teaching --> hard for me to comprehend --> I have C in his class.

How do I fix this? I have AP Spanish coming up as non-native speaker, so I want to resort most of my time to that instead of studying for chem. However, my chem teacher is a harsh grader, and would pick at the tiniest things. My homework grade is low too because I turned in a major hw assignment late, and he is only going to give me 50% for it (I have tried bargaining).

Anyways, theres only until the end of May for me to fix this. Any tips? What if I fail this course which completely impacts the trajectory of my life negatively. Idk anymore, kms.

I thought it would be like Fe2+ where it removes from the 2s orbital first, but it actually removes from the 2p orbital first. Is it because the 2p is closer to the nucleus and ions remove from the orbital that is closer to the nucleus?

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i'm not sure if this question belongs here, i was trying to find paracetamol notes in my lecture slides. And i have no idea what either of them are. can someone please help?

is it ok to use pipette uncertainty when calculating the uncertainty for concentration?

Hi, I’m currently studying chemistry in grade 12 and I’m trying to find the iodine value of peanut oil. I’m using the hanus method which is to add iodine monobromide with a sample of the oil and chloroform as a solvent. However for my experiment I replaced the chloroform with dichloromethane(DCM) instead I’m not allowed to use chloroform.

I mixed 10 ml of DCM, 20 ml of I-Br and 0.5g of the oil sample in a conical flask with a stopper(seen in the picture) and left the solution in the dark by wrapping it in aluminium foil for 30 mins.

Afterwards, I took the flask out and added 30% KI solution and rinsed down the sides with water.

I then titrated the solution with 0.1M sodium thiosulphate to get a straw pale colour.

However, when I tried to add 1% starch indicator solution to the straw pale solution, the mixture did not turn purple and I noticed my solution was starting to separate forming brownish blobs at the bottom of the flask leaving a yellowish mixture.

If anyone has any idea what I did wrong please help me! Thank you!

Stupid but needs answering, we’re doing titration and combine 10ml of 0.200M HCl with 40mL water then added 25mL 0.100M NaOH. when calculating the pH for equivalence do I include the entire volume of the HCl & water solution (50mL) or just the total amount of HCl (10mL)

edit: clarification on what im calculating 😶