Chemical Forums

Please login or register.

Login with username, password and session length

Sponsored links

Pages: [1] 2 3 ... 10
 1 
 on: Today at 03:54:00 AM 
Started by rolnor - Last post by rolnor
Is hydroiodic acid more powerfull vs hydrobromic acid for ether cleavage? I think it should be, itś a stronger acid and the iodo ion is a stronger nucleophile?

 2 
 on: Today at 03:27:37 AM 
Started by gapedbuh - Last post by gapedbuh
CLICK ON THE BANNER!

 
Gina was prone,gallery porn rodox vintage  almost lifeless lying on her counter top.Santos took a seat alongside the doctor's desk,kelly clarkson nip slip  and Hill sat back down too.
 
CLICK ON THE BANNER!

 
READ MORE
free pic nude celeb
Ethnic women backpack for school teenagers girls vintage stylish school bag ladies canvas backpack female back 33.96$
pregnant anime porn
asian woman f&#$
amateur cam sex video
bbs boy free loli nqxiz.info site
40cm 60 LED Christmas Tree Light Festival Home Shop Decoration-11.58 $
bra gallery teen
chat rooms for teenager
free picture video of woman naked
 
 
CLICK ON THE BANNER!

 
She pumped John’s cock like crazy as she came,lesbian movie star  almost crying out it felt so good.She heard Peyton tell Millie to 'come' and moments later both her daughter and the Golden Retriever with the wagging tail were at the door."Bye,huge hard nipples  Mommy Have a good day at the N-turn place" Jaydan bent down to give and get a hug big enough to last her until she got home around midnight after school and a six-hour shift waiting tables,Lenovo Vibe P1 4G Phablet-206.35 $   then kissed her daughter goodbye.Denise went outside with Jaydan and closed the door. "Sweetheart? I'm worried about you.Her chocolate silk smooth skin was unblemished,For iphone 7 plus 6 6s 5 5s se 4 4s diamonds case for iphone 6 1.99$  she still worked out,blonde swallow cum  didn't smoke or drink apart from a glass of wine with dinner. 5ft 9" tall,sexy teen thumb  weighing 120,adult friend finder messenger  her figure was as good as it was when she was 20.Her face was terrifically Caribbean,backseat bangers vanessa  pert round nose,big tit little pussy  huge dark eyes,pretty girl ugly guy  arching eyebrows.She had heard,gay latino male porn  and read,hot brunette teen blow job  and even seen a DVD of a blond being thoroughly screwed by a big black man.For the first time in over two years,leeann tweeden nude pic  he actually felt something for someone else.She pulled it out and admired it,amy hentai rouge sonic  it was a beautiful cock,Wenjie brother kids butterfly schoolbag backpack eva folded orthopedic children school bags for boys and girls 59.88$  one of like she had seen many times,adult email finder friend handle login member personals  but this one had the magic,Finow X3 Plus 3G Smartwatch Phone-108.99 $   this one did it for her.She wished she could give her a nice,30 grids clear plastic storage box for toys rings jewelry display organizer makeup case craft holder 18.32$  strong orgasm to help her de-stress,free big boob tgp  but unfortunately no opportunity arose for her to be alone with the older woman.Cassie and Kimmie,Gogloo 5 1080P FHD 173 Degree WiFi Action Camera-69.57 $   however,wet young clit  seemed to be taking every opportunity to sneak off and get familiar with one another.He leaned down and gathered my lips with his and we sank into a deep loving post coital kiss,fun teen chat  one that only lovers can share.As we recovered,xxx teen xxx  I held him in me,lasagna recipe  raised my left knee high and rolled him onto his side. "Now I've got you,gay intercourse " I told him,butt whipping  my legs wrapped around him,amp land chat  tight in my arms,hot f&#^$*@  I kissed him gently.He admitted,self bondage dreambook  "I'll be twenty-five next April."Kyra was in dread now; she was in dread because she now knew that she really was in trouble,greenguy link orama  and no apparent way out of it.Melanie calmly and methodically undid the buttons on Kyra's shirt,casada everytime touch we  and slid it over her shoulders leaving her proud firm *(#$ open to view. "Please Melanie,free anal f&#$ video  I'm so sorry,horny virgin  please forgive me,kama sutra art  I will never annoy you or cause you hurt ever again,celebrity nude robbs  please please forgive me?" she begged heartbrokenly.Melanie beamed at her,hard f&#^$*@ picture  "Oh Kyra you poor sweet darling,ass free pic thong  of course I forgive you,big free movie natural tit  I know you didn't mean to upset me,angelica sin freeones  I do forgive you my baby." Kyra choked a sob back with relief,CST-09 DIY 3D VR Glasses-15.39 $   expecting Melanie to let her go,Haier G6 MTK2502C Heart Rate Monitor Smart Bluetooth Watch-61.51 $   she thanked her profusely.It was all about her and Derek.""Yeah,gay marriage law  Derek's mentioned that before.

 3 
 on: Today at 03:24:29 AM 
Started by oilypiggy - Last post by Mitch
The diagram is about nuclei separation, it has little to do with electron separation. Once electrons are close enough to overlap and form bonds they become indistinguishable, and discussing electron distance from each other becomes a bit meaningless.

 4 
 on: Today at 01:28:25 AM 
Started by DeltaSubz - Last post by Borek
I just skimmed over your numbers and nothing sticks out as obviously incorrect, but there is one thing that I would do differently:

[H3O+] + (0.36 M) = [H2PO4-] + 2[HPO42-] +3[PO43-] + [OH-]

Instead of writing 0.036 M I would first list all ions with coefficients. Makes it easier to check what you are doing.

 5 
 on: Yesterday at 11:56:05 PM 
Started by Docather - Last post by P
Any advice would be great!

Did you get anywhere with this? Why the need to distinguish?

 6 
 on: Yesterday at 11:24:25 PM 
Started by DeltaSubz - Last post by DeltaSubz
Hey all, first post here  :D
Anyways, it seems there will be some mass/charge balance questions on my upcoming quant midterm and want to make sure i get this right. Im pretty sure i got the hang of mass balance, but not so much charge balance. An example problem is as follows, and my answers are in red...

A solution is prepared using 0.01 mol of Na2HPO4, 0.02 mol of Ca(H2PO4)2, and 0.02 mol of Mg3(PO4)2. In a total volume of  0.50 L.

a.   Write all mass balance equations for this solution
[Na+] = 0.04 M
[Ca2+] = 0.04 M
[Mg2+] = (3*0.02)/0.5 = 0.12 M
[H3PO4] + [H2PO4-] + [HPO42-] + [PO43-] = ( 0.01 + (2*0.02) + (2*0.02))/0.5 = 0.18 M


b.   Write the charge balance equation for this solution. Where appropriate, replace general concentration terms with actual concentrations.
[H3O+] + (0.36 M) = [H2PO4-] + 2[HPO42-] +3[PO43-] + [OH-]

Can anyone knowledgeable in this area verify whether this is right/wrong?

 7 
 on: Yesterday at 10:33:52 PM 
Started by Wanderer0 - Last post by AWK
Neither in crystals nor in solutions of ionic compounds have covalent bonds between ions. The total formula informs us only about the composition of the stoichiometric unit of the compound.

After graduation, the chemist has intellectual tools to imagine the structure of a not very complicated chemical compound from its total formula (not always correctly, but he knows where to check it), e.g. copper sulfate pentahydrate in the crystal has a structure [Cu(H2O)4]SO4·H2O, and in the solution there are ions [Cu(H2O)6]2+ next to hydrated sulfate ions with undefined stoichiometry of water molecules (and therefore the water is omitted in ions, or it is included in the form of SO42-(aq) and then when balancing chemical reactions we neglect this (aq).

At pH 9, the solution also contains 10,000 times more OH- ions than the H3O+ ions. For both salts, the concentration of hydroxide ions is sufficient to immediately produce Cu(OH)2 (anhydrous) and Fe(OH)2 (hydrated with undefined stoichiometry)

You can find the rest in good textbooks.

 8 
 on: Yesterday at 10:18:26 PM 
Started by Wanderer0 - Last post by Borek
Will Fe2+ ions continue binding to SO42- until all are oxidased?

Ions in the solution, after dissociation, are not bound to any specific ion. The only thing that matters is that the solution is electrically neutral, what ions are present doesn't matter.

Ions can react and interact, making complexes or precipitates, but that's not the case of Fe2+ and SO42- (or, rather - complexing properties of SO42- are way too low to matter).

 9 
 on: Yesterday at 10:05:10 PM 
Started by Mitch - Last post by Borek
Nothing here, but my connection is rather slow, so chances are what I see is not limited by the software.

OTOH footer contains information about how fast the page was created - it is below 0.2 sec now ("Page created in 0.135 seconds with 29 queries."), I believe it was below 0.2 s before as well. From what I remember for human interaction everything below 0.25 s counts as "instant".

 10 
 on: Yesterday at 09:00:11 PM 
Started by Ondex - Last post by Ondex
Guys i think i did it.
I made some changes in the process of HEDP neutralisation and mixing of all ingredients, have already gone 2 days and no any cristals!!
I will try to oscillate the storage temperature to boost the crystallization processes, if it can still take place.
After 10 days I will be sure of the experiment.
Have a nice day!

Pages: [1] 2 3 ... 10

Mitch Andre Garcia's Chemical Forums 2003-Present.

Page created in 0.098 seconds with 16 queries.