Search found 974 matches

by ChenBeier
Tue Nov 30, 2021 5:01 am
Forum: Chemistry forum
Topic: Complete the equation of chemical reaction
Replies: 3
Views: 59

Re: Complete the equation of chemical reaction

For this you need only to bake the Acetate. Dont need impurities with carbon compounds.
by ChenBeier
Tue Nov 30, 2021 4:52 am
Forum: Chemistry forum
Topic: Complete the equation of chemical reaction
Replies: 3
Views: 59

Re: Complete the equation of chemical reaction

Nothing useful. A slight alcaline oil and a salt nothing special will happen.
For what purpose is this mixture.
by ChenBeier
Sat Nov 27, 2021 5:30 am
Forum: Chemistry forum
Topic: esterification reactions
Replies: 2
Views: 65

Re: esterification reactions

For what purpose, but try it. If surfactant will not decompose.
by ChenBeier
Sat Nov 27, 2021 1:07 am
Forum: Chemistry forum
Topic: Need help with this.
Replies: 1
Views: 57

Re: Need help with this.

It is to remove excess carbonyl compounds. It react to a Hydroxyalkylsulfonate
RR'CO + HSO3- => HO-RR'CSO3-
by ChenBeier
Thu Nov 25, 2021 6:44 am
Forum: Chemistry forum
Topic: Difficulty calculating OH with quadratic formula
Replies: 26
Views: 270

Re: Difficulty calculating OH with quadratic formula

The same error. Mix of H+ and OH-.
by ChenBeier
Thu Nov 25, 2021 6:43 am
Forum: Chemistry forum
Topic: What is the reaction product of ester and ammonia?
Replies: 1
Views: 39

Re: What is the reaction product of ester and ammonia?

Probably an alkaline ester cleavage. Get the alcohol and the amid of the acid.
by ChenBeier
Tue Nov 23, 2021 1:33 am
Forum: Chemistry forum
Topic: Difficulty calculating OH with quadratic formula
Replies: 26
Views: 270

Re: Difficulty calculating OH with quadratic formula

I read the thread in the excel forum. I think there is already some confusion. They talking about add NaOH and pH get acidic. That is wrong. The mistake is in your sheet you claiming for pH, but it isn't . The 2.32 is the pOH. Also there is a mixup between pka, pkb pH and pOH There are two equations...
by ChenBeier
Mon Nov 22, 2021 2:28 pm
Forum: Chemistry forum
Topic: Difficulty calculating OH with quadratic formula
Replies: 26
Views: 270

Re: Difficulty calculating OH with quadratic formula

That is all OK, but you use in both cases the same concentration for OH- and for H+ what was 0,00475 mol. In one case you get the right numbers in the other case not. The H+ concentration is different. cOH- of 0,00475 refers to pOH 2,323 or pH 11,676 This alkaline solution contain H+ ions as well. p...
by ChenBeier
Mon Nov 22, 2021 10:37 am
Forum: Chemistry forum
Topic: Difficulty calculating OH with quadratic formula
Replies: 26
Views: 270

Re: Difficulty calculating OH with quadratic formula

In the box R 14 the - moles has to be used as H+. You used OH-. Probably also the equilibrium of water has to be considered but I didn't checked it.

Also in the box X 3 above the result ist not pH its pOH. So there is some mixed up generally.
by ChenBeier
Mon Nov 22, 2021 10:00 am
Forum: Chemistry forum
Topic: Difficulty calculating OH with quadratic formula
Replies: 26
Views: 270

Re: Difficulty calculating OH with quadratic formula

Let say in this way you have a NaOH solution containing 0,19 g = 0,00475 mol NaOH = OH- , in this solution we have also H+ . So if you have kb then use OH- If you use ka then instead H+ has to be used. It's similar pH = - logcH+, but pOH = -logcOH- You can not use the same number 0,00475 for cH+ and...
by ChenBeier
Mon Nov 22, 2021 8:50 am
Forum: Chemistry forum
Topic: Calculating enthalpy
Replies: 1
Views: 55

Re: Calculating enthalpy

You have 90 g H2 and 90 g O2 correct.
That mean you have 90/2 = 45 mol H2 and 90/32 = 2,81 mol O2
So you can only do the double what means 5,625 mol H2 bring in reaction
You will get the same amount of water, what is x 18 g/ mol = 101,25 g. The rest of 78,75 g = 39,375 mol H2 is not used.
by ChenBeier
Mon Nov 22, 2021 8:36 am
Forum: Chemistry forum
Topic: Difficulty calculating OH with quadratic formula
Replies: 26
Views: 270

Re: Difficulty calculating OH with quadratic formula

Did you read what I wrote above. If you use kb then c OH- has to be used. If you use ka then c H+. I think that is the key. First figure out what is the right calculation. Excel is only a tool, what will not solve the problem. initial molarity =C -molarity X pKa -.00475 X 0.63095734448019300000 = -2...
by ChenBeier
Mon Nov 22, 2021 5:37 am
Forum: Chemistry forum
Topic: Difficulty calculating OH with quadratic formula
Replies: 26
Views: 270

Re: Difficulty calculating OH with quadratic formula

pKb = 13,8 pKa = 0,2
c OH- = 0,00475 mol/l , c H+ = 2,11 * 10^-12 mol/l
Calculate with this one
by ChenBeier
Mon Nov 22, 2021 4:52 am
Forum: Chemistry forum
Topic: Difficulty calculating OH with quadratic formula
Replies: 26
Views: 270

Re: Difficulty calculating OH with quadratic formula

I think the problem is the 0,0475 moles. This has also converted to H+ isn't it.
by ChenBeier
Mon Nov 22, 2021 4:22 am
Forum: Chemistry forum
Topic: Difficulty calculating OH with quadratic formula
Replies: 26
Views: 270

Re: Difficulty calculating OH with quadratic formula

Now I understood what you are talking about. But you mixed strong acid/ base with the weak polyprotic once like HSO4-, H3PO4 and its dissociated. Of course here we have to consider all H+ especially dilution is high and also dissociation is high. But for one protic acid like HCl or base NaOH these c...