hypervalent_iodine

! Moderator Note I'm moving this thread to Speculations. OP, you need to start providing some actual support for your argument beyond your own heartfelt desires, or this will be closed. Do not respond to this note within the thread. Please PM staff or report this post.

I can't think of any, really. You could try and associate the theories with something pictorial or in some way visual? That used to help me. Otherwise, just practice writing a sentence description of them all until you are bored to tears of it.

! Moderator Note I've split a number of posts into a new thread. Please try and stick to the confines of the OP.

It would probably help you to come up with a mathematical equation for the molecular mass of air, incorporating the molecular mass of O2 and N2. A hint by way of analogy: let's say I have a 20 kg pile of bricks that has some percentage of large bricks that weigh 1kg and some percentage of smaller bricks that weigh 200 g. I know that the mass of the small bricks plus the big bricks adds up to 100% of the mass of bricks that I have, and that 100% of the bricks is equal to 20 kg. I could then come up with an equation to define this, which I will let you figure out. .

Why would you use the HH for this? I can't see how that answers the question at all. You have a reaction between a strong base and a weak acid, meaning that all of the amino acid has reacted. You have the final pH, and you have the concentration of the NaOH initially, so the question is really just one of stoichiometry. OP: the first thing you need to figure out is what value you need to get the final answer. If it is asking you molar mass, what is the equation for that? What part of that equation do you have, and what do you need? Once you identify that, you then need to identify how to get that number (sorry, I know that sounds patronizingly obvious). I gave a hint above, but it would be helpful if you wrote out a general equation for the reaction between an amino acid (you will need to figure out if it is mono or diprotic based on the pKa information given) and NaOH.

It depends on if it's D or L, but you should be able to figure out which side it's on based on the structure you have. Could you draw a picture?

It's possible to get both. Which one do you want?

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Tampitump has been suspended for three days for abusive behavior.

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I am a bit confused as to why you're trying to do this? Who is 'them,' and what do you need to demonstrate? What is this meant to be representative of?

Where are you stuck?

! Moderator Note michel123456, I believe you have asked questions along these lines elsewhere. Please do not drag this thread off topic with the same ones.

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I would hesitate to say an ester with 7 carbons and only two 1H singlet peaks. That being said, that spectra seems wildly unlikely / impossible for any other structure I can think of. OP, can you please provide more information. Perhaps a picture of all the data you have? How do you know there's an OH? What are the integration ratios in your NMR? Edit: just noticed you included integration. This doesn't match with your molecular formula, which tells me something isn't right. Please post copies of your spectra for us to view and we can better help you.

Additionally, it's Na3BO3, not NaBO3

! Moderator Note Let's skip the religious debate, please

! Moderator Note Last chance. Back up your numbers, as requested, or this gets closed.

I believe this is correct. Different labs will have different preferences for quenching LiAlH4. My lab likes to use Na2SO4. I've also used plain water followed by slow addition of H2SO4. Make sure you quench cold, slowly, and preferably while still under inert atmosphere.

What do you think? What sort of functional groups are present? What sort of reagent is NaOH? What sorts of reactions do you know of involving these things? We are happy to help you, but we won't do your homework for you. Please give more information on where you are stuck.

It will be as written. I realised I made a typo in my last post. I meant to just say that both would exist as shown on the wiki article. The N oxide will be deprotonated and the alcohol will remain protonated.

Do you mean the alcohol proton or the N-oxide oxygen? In either case, no. It will probably be as shown in the wiki page.

I think you've missed my point. I happen to agree with what you've said, I was just trying to shed light on her position and why she might have reacted as she did. I would like to leave this part of be conversation here, in any case.

Agreed.

I get that, but in fairness, much of the advice given was related to a single comment in the OP rather than the actual question. I suppose being more familiar with what she is going through I am more forgiving of her reaction. Consider that she has probably been at her wit's end with this issue for many years, and tried many avenues to get her son to eat better. It's not hard to imagine that in her shoes, you might also be touchy about strangers stepping in and giving advice you weren't necessarily asking for.