Search found 739 matches

by ChenBeier
Thu Apr 22, 2021 11:18 pm
Forum: Chemistry forum
Topic: Finding out unknown compound in the solution and boiling point of the solution
Replies: 7
Views: 102

Re: Finding out unknown compound in the solution and boiling point of the solution

Calculation is ok.
But without more information it is impossible to find out which compound it is.
by ChenBeier
Thu Apr 22, 2021 8:59 am
Forum: Chemistry forum
Topic: Zbilansowanie aspiryny
Replies: 1
Views: 28

Re: Zbilansowanie aspiryny

by ChenBeier
Wed Apr 21, 2021 9:05 am
Forum: Chemistry forum
Topic: How to compute pH of ((COOH)2) Oxalic acid?
Replies: 3
Views: 56

Re: How to compute pH of ((COOH)2) Oxalic acid?

pH 1.27 is for 0.1 mol/l not for 1 mol/ l
by ChenBeier
Mon Apr 19, 2021 10:01 pm
Forum: Chemistry forum
Topic: HELP! Mechanism for formation of Br2 from H2O2 and HBR
Replies: 1
Views: 33

Re: HELP! Mechanism for formation of Br2 from H2O2 and HBR

Itis a redox reaction

2 Br- => Br2 + 2 e-

H2O2 + 2H+ + 2 e- => 2 H2O
by ChenBeier
Mon Apr 19, 2021 9:58 pm
Forum: Chemistry forum
Topic: PLEASE HELP complete the equation
Replies: 1
Views: 61

Re: PLEASE HELP complete the equation

Check for redox reaction of Permanganate and oxalic acid. Discussed several times. Bariumsulfat is spectator.
by ChenBeier
Mon Apr 19, 2021 11:23 am
Forum: Chemistry forum
Topic: How to convert PPB to molarity?
Replies: 6
Views: 66

Re: How to convert PPB to molarity?

No, you have a error of factor 10. The unit is also wrong what is M/l in your opinion.
M is mol/l. Not mol/ l^2.
by ChenBeier
Mon Apr 19, 2021 10:20 am
Forum: Chemistry forum
Topic: How to convert PPB to molarity?
Replies: 6
Views: 66

Re: How to convert PPB to molarity?

There is no. %, ppm, ppb are parts of a mass unit. For volume you can estimate because 20 ppb is at least nothing. The solution is like water.
by ChenBeier
Mon Apr 19, 2021 8:15 am
Forum: Chemistry forum
Topic: How to convert PPB to molarity?
Replies: 6
Views: 66

Re: How to covert PPB to molarity?

20 ppb = 20 mikrogramm/kg = 2*10^-5 g /kg / 207 g/ mol = 0,096 mikromol/kg= 9,66 * 10^-8 mol/kg ~ 1*10^-7 mol/l

For what you need density. It is an aquaeous solution and not solid lead.
by ChenBeier
Mon Apr 19, 2021 3:18 am
Forum: Chemistry forum
Topic: Name the substance
Replies: 5
Views: 102

Re: Name the substance

3(R),7- Dimethyl-cis-oct-6-en-1-al
by ChenBeier
Mon Apr 19, 2021 3:15 am
Forum: Chemistry forum
Topic: Balance Equation
Replies: 1
Views: 80

Re: Balance Equation

First CuI2 is not existing. Only CuI is existing.

But nevertheless skip all spectator ions.

Oxidation is I- + 2 Cl- => ICl2- + e-
Reductiun is Ce 4+ + e- => Ce 3+
by ChenBeier
Sun Apr 18, 2021 9:54 pm
Forum: Chemistry forum
Topic: Why doesn't Si + Wo3 ignite?
Replies: 2
Views: 71

Re: Why doesn't Si + Wo3 ignite?

Why it should be. Acivation energy level is very high. But I think if you heat the mixture to some hundreds degree a reaction can take place. If silicon as a reducer is strong enough I dont know. Better use aluminium instead.
by ChenBeier
Sun Apr 18, 2021 4:28 am
Forum: Chemistry forum
Topic: What happens when you mix Hypochlorous Acid and Vinegar?
Replies: 3
Views: 95

Re: What happens when you mix Hypochlorous Acid and Vinegar?

First reaction is develop Oxygen

2 HOCl => 2 HCl + O2

Second reaction is to develop chlorine if enough chlorid is produced

HOCl+ HCl => Cl2 + H2O