That seems to work better for me most of the time, but not all of the time... it might just depend on the lecturer (and obviously the material and student). I guess there's two main ways I look at it:
1.) Go to lecture first to be introduced to the material. This makes it much more familiar...
I know someone who triple majored in English/theater/psychology but that is much different than majoring in e.g. some engineering/foreign language/accounting. What I'm saying is that it would depend on the individual course loads and how much requirements and electives could overlap (also how...
right; first I was confused why I kept on being told that CH3NH3Br went right to CH3NH3+ and Br- now I see how it gets there.
I meant lopsided by the fact that in the second step, (that is, between the newly formed CH3NH2 and H30+ and the resulting CH3NH3+) there were 0.0M CH3NH3+ and .15M...
This is the third time I'm trying to post and physicsforums keeps saying that some security token is missing and I lose the post.
I think I get it
CH3NH3Br -> CH3NH2 and H30+ and Br-
now, I'm going to just reverse the next step I had in my last post and it makes this much more clear...
step-by-step:
CH3NH3Br is a salt and dissociates as:
CH3NH3Br -> CH3NH2 + HBr
CH3NH2 protonates:
CH3NH2 and H20 <-> CH3NH3+ and OH-
but there's also:
HBr -> H+ and Br-
now, while CH3NH2 protonates to give us the CH3NH3+, the Kb given for that seems to suggest it's not going to be much of a...
alright, I saw in a couple places that CH3NH3Br and CH3NH3Br were salts of CH3NH2 and HBr/HCl but they were probably just wrong. the ionic bonding makes sense, thanks.
ok so we have:
CH3NH3Br -> CH3NH3+ and Br-
Br- is a spectator ion and is no longer needed
CH3NH3+ and H20 <-> CH3NH2 and H30+
Ka = Kw/Kb(of reverse which was given)
Ka = 1.0*10^-14 / 4.4*10^-4
and so on. That's exactly what I had in my first post. I later stated what I don't understand...
am I able to use the same equilibrium constant for CH3NH2+ as I do with CH3NH2? The question doesn't give any information about CH3NH2+ and I don't see it in the book's appendix
Also, if CH3NH3Br -> CH3NH2+ and Br-
what happened to the other H? and is that dissociation complete or at...
What is the pH of .15 M methylammonium bromide, CH3NH3Br (Kb of CH3NH2 = 4.4x10^-4)
I actually asked this to someone else and got this:
It just doesn't seem right. To use the information given for CH3NH2 we need to first have CH3NH3 or CH3NH2 in the solution but we start with CH3NH3Br. Where...
I'm sure you could take some classes part time at a local community college during evenings or around your work schedule as a non-degree seeking student. There would likely be a large variety of first and second year offerings you may be interested in. Some standards would include principles of...
I have spent a great year at a local community college (in Ohio), and combined with some summer credits there and credits from high school will have virtually all of my general curriculum done and most first year/some second year stuff. My planned major is Chemical Engineering.
I guess one...
What do you mean? notice that there are two structures separated by a bit of whitespace. The top structure has no hydrogens on the carbons. Would you like me to draw the lone pairs?
below are two simple compounds. this is from a first semester general chemistry test and there were four compounds total all with the same number of C H and O we had to tell which one was least stable and why.
I don't remember the other two because both had a formal charge of 0 on everything...