Search found 1624 matches

by expert
Sun Dec 04, 2016 12:18 am
Forum: Chemistry forum
Topic: Salicylic acid
Replies: 2
Views: 11782

Try o solve this problem "backwards"
For example, salicylic acid can be produced from phenol
https://en.wikipedia.org/wiki/Salicylic_acid
Use Wikipedia as your source

This reaction is doubtful
C6H5Cl + NaOH ---> C6H5OH + NaCl

Some alkylchlorides can do this but not arylchlorides
by expert
Sun Nov 27, 2016 9:24 pm
Forum: Chemistry forum
Topic: I need your help guys!
Replies: 3
Views: 6533

Wikipedia is a good starting point

https://en.wikipedia.org/wiki/Chemical_reaction
by expert
Wed Nov 23, 2016 11:45 pm
Forum: Chemistry forum
Topic: (NH4)3N+HNO3=NH4NO3+NH3
Replies: 1
Views: 11222

Please try to figure our what 3N means. Correct the error and come back with your question
by expert
Wed Nov 23, 2016 11:41 pm
Forum: Chemistry forum
Topic: NaOH + SO4
Replies: 10
Views: 37131

H2S reacts with NaOH producing Na2S Both H2S and Na2S can oxidize, ultimately into Na2SO4. This salt is water soluble. NaOH is also water soluble and ionizes NaOH ==> Na(+) + OH(-) if SO4(2-) present, all ions will be in a free exchange. If water removed, Na2SO4 may crystallize. When water added, th...
by expert
Sun Nov 13, 2016 10:33 pm
Forum: Chemistry forum
Topic: NaOH + SO4
Replies: 10
Views: 37131

H2S may oxidize under certain conditions into H2SO4 sulfuric acid that can dissociate in aqueous solution to two protons H+ and SO4 (2-) Sodium hydroxide also dissociates to Na+ and OH- When acid and base such as NaOH mix, they will form salt and water 2NaOH + H2SO4 = Na2SO4 + 2H2O You can write the...
by expert
Fri Nov 04, 2016 7:38 pm
Forum: Chemistry forum
Topic: Glycosidic bond in DNA?
Replies: 1
Views: 4178

Glycosidic bond explanation
https://en.wikipedia.org/wiki/Glycosidic_bond

Nucleic acids do contain glycosidic bonds, yes, but there are other bonds there. For example, phosphodiester bond that is more specific to nucleic acids
https://en.wikipedia.org/wiki/Phosphodiester_bond
by expert
Sun Oct 30, 2016 8:38 pm
Forum: Chemistry forum
Topic: Can flashpoint be calculated from flashpoint of components?
Replies: 3
Views: 4691

After I wrote my answer I found this useful study. I'm sure you can figure out
http://dl.uctm.edu/journal/node/j2006-3 ... 91-296.pdf
by expert
Sun Oct 30, 2016 8:33 pm
Forum: Chemistry forum
Topic: Can flashpoint be calculated from flashpoint of components?
Replies: 3
Views: 4691

Good question but the answer is possibly the following. When you mix relatively similar amounts (such as 1:2) of two different flammable materials, flashpoint possibly will be controlled by the most flammable material so it will be close to 110°C
by expert
Sun Oct 30, 2016 8:27 pm
Forum: Chemistry forum
Topic: Analytical chemistry
Replies: 2
Views: 4369

to oxidize Manganese (not Mabganese) into Permanganate.

Read Wikipedia
https://en.wikipedia.org/wiki/Permanganate
you can dissole manganese in hydrochloric acid and then oxidize obtained MnCl2

Read Wikipedia about periodate

https://en.wikipedia.org/wiki/Periodate
by expert
Sun Oct 30, 2016 8:17 pm
Forum: Chemistry forum
Topic: Creating Heat Under Pressure
Replies: 1
Views: 3768

Everything is possible with the chemistry but your project is not very clear and looks not very safe.
by expert
Tue Oct 18, 2016 9:00 pm
Forum: Chemistry forum
Topic: Free so2 Calc
Replies: 1
Views: 5129

check this article
http://www.hach.com/asset-get.download. ... 9641556310

or Google the following: Free, Total and Double SO2 in Wine
by expert
Tue Oct 18, 2016 8:56 pm
Forum: Chemistry forum
Topic: giuÌp tôi giải baÌ€i hoÌa naÌ€y
Replies: 1
Views: 4114

Nó là rất không chắc rằng hydro và NO sumulteneously sẽ hình thành trong một phản ứng. Vấn đỠlà không đúng vì sau khi thêm axit và thậm chí cả nước, tất cả các loại phản ứng sẽ xảy ra. Ví dụ kẽm sẽ phản ứng với Fe (NO3) 2 và H2SO4 ...
by expert
Mon Oct 17, 2016 10:23 am
Forum: Chemistry forum
Topic: Is PVC Safe? Is PVC Toxic ?
Replies: 1
Views: 3662

PVC itself is not soluble in water, and therefore may not present health hazard by itself. At the same time, any polymer always contains some other small molecules as plasticizers, stabilizers, residual catalysts etc . These small molecules may leach into water or food and therefore may present heal...
by expert
Sun Oct 16, 2016 10:56 pm
Forum: Chemistry forum
Topic: Parts per million?
Replies: 1
Views: 5036

Are you still struggling with this problem? Here is your reaction: H2SO4 + NaOH + HCl = Na2SO4 + NaCl + H2O 25ml portion of 0.0100mol/l NaOH = 0.25 mmol 13.6ml of 0.0100mol/l HCl = 0.136 mmol Excess of NaOH = 0.25 - 0.136 = 0.114 mmol that is neutralized by H2SO4: 2NaOH + H2SO4 = Na2SO4 +2H2O Amount...
by expert
Sun Oct 16, 2016 10:15 pm
Forum: Chemistry forum
Topic: electrolysis reaction
Replies: 1
Views: 10280

Anode: positively charged terminal - oxidation reaction.
Cathode: negatively charged terminal - reduction reaction

Ti metal anode will oxidize to TiO2 while Stainless steel cathode will not change, and will generate hydrogen due to water electrolysis