Search found 24 matches

by vhpk
Tue Apr 29, 2008 4:12 am
Forum: Chemistry forum
Topic: oxalic acid
Replies: 1
Views: 2248

oxalic acid

I want to ask if HOOC-COOH react with the aqueous solution of bromine ( Br2 aq).
Any help would be highly appreciated
by vhpk
Fri Jun 08, 2007 9:17 pm
Forum: Chemistry forum
Topic: gases
Replies: 1
Views: 4671

gases

How can we separate NO and NO2 out of the mixture include: NO and NO2
by vhpk
Wed Apr 04, 2007 5:22 pm
Forum: Chemistry forum
Topic: what is the answer ?
Replies: 1
Views: 3168

Ca(OH)2 + Al3+ --> Al(OH)3 + Ca2+
Al(OH)3 + OH- --> Al(OH)4-
by vhpk
Fri Mar 30, 2007 8:59 pm
Forum: Chemistry forum
Topic: Analysis Quantitative (Zn, Cu)
Replies: 1
Views: 3131

I don't understand your post very much, but maybe you can use NH3 to make [Zn(NH3)4](OH)2 and Cu(OH)2
by vhpk
Tue Feb 27, 2007 4:49 am
Forum: Chemistry forum
Topic: Please help...
Replies: 4
Views: 6764

Someone tells me that we can produce Cr(OH)3 from BaCrO4 by the reaction of BaCrO4 and HCl to make Cr2O7 2- then we can make Cr(OH)3 but I don't know to write the reaction, can you help me :D
by vhpk
Sun Feb 25, 2007 7:50 pm
Forum: Chemistry forum
Topic: Please help...
Replies: 4
Views: 6764

can anyone help me with this reaction:
How to make Cr(OH)3 from BaCrO4 ( of course through some reactions)
Thanks for your help
:D
by vhpk
Tue Feb 20, 2007 7:35 pm
Forum: Chemistry forum
Topic: Chemical Equations...
Replies: 2
Views: 4769

Your reaction is a redox reaction: Na + H2O --> NaOH + 1/2H2 Redox reaction means in this reaction there is a change about oxidation number. Methatesis reaction means in this reaction, the reactants change their part to each other: BaCl2 + H2SO4 --> BaSO4 + 2HCl In this reaction, BaCl2 move its Cl a...
by vhpk
Mon Feb 19, 2007 1:52 am
Forum: Chemistry forum
Topic: Redox reaction
Replies: 3
Views: 6457

Thanks a lot Peter :D :D
by vhpk
Sat Feb 17, 2007 7:27 pm
Forum: Chemistry forum
Topic: help help help HELP!!!
Replies: 2
Views: 4620

This reaction can't happen, because in this reaction there is the reducing from Cu2+ into Cu+ but there isn't any oxidizing, so this is a really wrong reaction
by vhpk
Sat Feb 17, 2007 7:24 pm
Forum: Chemistry forum
Topic: Redox reaction
Replies: 3
Views: 6457

plz help me :(
by vhpk
Thu Feb 15, 2007 2:48 am
Forum: Chemistry forum
Topic: Redox reaction
Replies: 3
Views: 6457

Redox reaction

Can you help me to complete these reactions :D P4 +.... + ...-->.... + K......... NH2OH + Cu...--> N2O +.... +....... B2H6 +..... --> H2 +.......... BCl3 + CO --> ....... + C ---> NaCN ...... +..... + NaOH --> NaNO2 +..... .... + NH3 --> M3N2 +...... ( M is a metal with the valence 2) Thanks a lot :D
by vhpk
Wed Feb 14, 2007 6:50 pm
Forum: Chemistry forum
Topic: oxidation number of molecules and ions
Replies: 3
Views: 10013

Remember all the molecules have the neutralization about charge, so their oxidization number are 0, the oxidization of ions are their charge, so u can see with PF6-, its oxidization number is 1-.
by vhpk
Wed Feb 14, 2007 6:41 pm
Forum: Chemistry forum
Topic: Manganese Reaction
Replies: 2
Views: 5276

Does this reaction happen in acidic solution, base solution or water or in another solution
by vhpk
Tue Feb 13, 2007 7:19 pm
Forum: Chemistry forum
Topic: problems with equation
Replies: 4
Views: 6938

5Fe2(C2O4)2 + 4KMnO4 + 16H2SO4 --> 10FeSO4 + 2K2SO4 + 4MnSO4 + 20CO2 + 16H2O
Is that right :D
by vhpk
Tue Feb 13, 2007 7:08 pm
Forum: Chemistry forum
Topic: Help!!!!!
Replies: 11
Views: 14038

Thanks a lot Peter, can you share me your experience to find the reactants and the products of redox reactions