Search found 1570 matches

by ChenBeier
Sun Apr 14, 2024 2:30 pm
Forum: Chemistry forum
Topic: please help
Replies: 8
Views: 872

Re: please help

Which one
1,2-Propylene glycol or 1,3 Propylene glycol

But above you write in opposit direction
Propylen glycole down to ethylen glycole

Ethylenglycole to Glycolaldehyd HOCH2CHO
Glycolaldehyd + Methylgrignard => 1,2- Propylenglycol
by ChenBeier
Sun Apr 14, 2024 2:18 pm
Forum: Chemistry forum
Topic: please help
Replies: 8
Views: 872

Re: please help

Ok, where should the carbondioxide comes from?
What is your question
by ChenBeier
Sun Apr 14, 2024 2:11 pm
Forum: Chemistry forum
Topic: please help
Replies: 8
Views: 872

Re: please help

C3H8O2 => 4 C2H6O2 + 3 CO2

What is C3H8O2 and C2H6O2? Propandiol and ethandiol?

What help you need?
by ChenBeier
Sun Apr 14, 2024 9:22 am
Forum: Chemistry forum
Topic: torasemide
Replies: 1
Views: 613

Re: torasemide

This is a chemical and not medicinic forum. Please ask there.
by ChenBeier
Thu Apr 11, 2024 12:11 am
Forum: Chemistry forum
Topic: My question really is where does the disulfide bridge go
Replies: 1
Views: 643

Re: My question really is where does the disulfide bridge go

Normaly the Disulfid will connect two Polymer chain or the same chain for folding each other. Its also called crosslinking.

https://en.m.wikipedia.org/wiki/File:Di ... C)_V.1.svg
by ChenBeier
Tue Apr 09, 2024 7:43 am
Forum: Chemistry forum
Topic: Mg(OH)2 + CaCO3 + H2O = Mg(HCO3)2 + Ca(OH)2
Replies: 3
Views: 654

Re: Mg(OH)2 + CaCO3 + H2O = Mg(HCO3)2 + Ca(OH)2

I dont think so, because the equilibrium will be on left side. Two precipitate on left and on right side only one.
Check the solubility constant from each product.
Also hydrogencarbonate is slightly acidic. Calcium hydroxide strong alcaline, this will neutralise.
by ChenBeier
Tue Apr 09, 2024 4:56 am
Forum: Chemistry forum
Topic: Mg(OH)2 + CaCO3 + H2O = Mg(HCO3)2 + Ca(OH)2
Replies: 3
Views: 654

Re: Mg(OH)2 + CaCO3 + H2O = Mg(HCO3)2 + Ca(OH)2

First the equation is not balanced, second why do you think this should happen. To get hydrogencarbonate excess of carbondioxide is needed.
This works without and with the calcium already.
Can be find in stalactite caves.
by ChenBeier
Mon Apr 08, 2024 10:59 pm
Forum: Chemistry forum
Topic: Exercise on pH
Replies: 3
Views: 2116

Re: Exercise on pH

That is what I said above. Why repetation.
by ChenBeier
Mon Apr 08, 2024 3:07 am
Forum: Chemistry forum
Topic: Question on Molarity and Solubility
Replies: 5
Views: 952

Re: Question on Molarity and Solubility

Read the principles of Le Chatelier. Here you make from two reactants one product. So it means decrease Volume or increase pressure will give more product .Figure out is the reaction exothermic or endothermic. Means consume or release heat. If it consumes rise temperature, in other case decrease tem...
by ChenBeier
Sun Apr 07, 2024 11:38 pm
Forum: Chemistry forum
Topic: I need help with some questions and types of problems
Replies: 1
Views: 620

Re: I need help with some questions and types of problems

1. Soap is made of amphipathic particles, the hydrophil part dissolves in water the hydrophob part in fat or oil. The soap molecules develop micelles. A dirt particle is fatty, so the particle will be surounded from the soap molecules, by stickig the hydrophob part in. The hydrophil part will be in ...
by ChenBeier
Fri Apr 05, 2024 1:04 am
Forum: Chemistry forum
Topic: Understanding the Equilibrium Constant Expression
Replies: 1
Views: 571

Re: Understanding the Equilibrium Constant Expression

Law of mass action

K = C^c*D^d/(A^a*B^b)

K = constant, so changes of one component will affect all others.

https://www.chemistrylearner.com/law-of ... ction.html
by ChenBeier
Tue Apr 02, 2024 11:25 pm
Forum: Chemistry forum
Topic: How to make Sodium hydroxymethanesulfonate
Replies: 11
Views: 2047

Re: How to make Sodium hydroxymethanesulfonate

No it doesn't effect.
by ChenBeier
Thu Mar 28, 2024 4:01 am
Forum: Chemistry forum
Topic: Redox reactions
Replies: 5
Views: 3096

Re: Redox reactions

Because in the logarithmen I used cox/cRed. Not the opposit. Log cox/ cred = - log cred/cox log/cI2/c^2I- = - logc^2I-/ cI2 https://en.m.wikipedia.org/wiki/Nernst_equation You are right it should be a minus like in the Literature but also the reduced form as numerator and the oxidised form as denomi...
by ChenBeier
Thu Mar 28, 2024 12:50 am
Forum: Chemistry forum
Topic: Redox reactions
Replies: 5
Views: 3096

Re: Redox reactions

Redox Potentials are measured to hydrogen and considered as oxidation.
I-/I2 is positiv. 0,535 V
NO2-/ NO3- is also positiv 0,94 V

Elements are put in by definition as 1 .