Search found 1542 matches

by ChenBeier
Mon Aug 02, 2021 11:43 am
Forum: Chemistry forum
Topic: aluminum sulfate question
Replies: 18
Views: 9573

Re: aluminum sulfate question

I can teach here. Other people also can watch and participate in the conversation.
by ChenBeier
Fri Jul 30, 2021 1:58 am
Forum: Chemistry forum
Topic: aluminum sulfate question
Replies: 18
Views: 9573

Re: aluminum sulfate question

I think you have raw product, which contains also iron, thats why the solution gets amber colour. 1 g Al2O3 is equal to 3.35 g Al2(SO4)3 = 6,53 g Al2(SO4)3 × 18 H2O Its not clear what useful oxids mean. If it contain only 17% Al2O3, what is the 83% ? Sulfur and oxygen, water, iron, anything else? If...
by ChenBeier
Thu Jul 29, 2021 11:27 am
Forum: Chemistry forum
Topic: Electrochemistry question
Replies: 5
Views: 4695

Re: Electrochemistry question

m = I*t*M(Ag)/(n*F)
m = Rho*V
V = th* A
Rho*th*A = I*t*M(Ag)/(n*F)
t= Rho*th*A* n*F/(I*M(Ag))

m= mass, I = current, t= time, M(Ag) molar mass of silver, n= amount of electrons to Transfer, F Faradyconstant, Rho = specific gravity of silver, th = thickness of plated silver, A = surface of cup
by ChenBeier
Thu Jul 29, 2021 11:10 am
Forum: Chemistry forum
Topic: aluminum sulfate question
Replies: 18
Views: 9573

Re: aluminum sulfate question

Aluminiumsulfate is a white power and should be dissolved in water without any colour. Depending of the pH aluminiumhydroxide can precipitate. Addition of some sulfurc acid helps. Where does the ambor colour comes from.
by ChenBeier
Thu Jul 29, 2021 12:25 am
Forum: Chemistry forum
Topic: Solución Sulfato de Aluminio
Replies: 1
Views: 3105

Re: Solución Sulfato de Aluminio

We dont speak spanish.
by ChenBeier
Wed Jul 28, 2021 2:39 am
Forum: Chemistry forum
Topic: Redox reactions
Replies: 6
Views: 5052

Re: Redox reactions

I dont understand how you develop the part equations. In e) for example you use OH- even the reaction takes place with HCl. With mathematics a lot can do even the final result is correct but generally its wrong. To start like this d) S 2- => S + 2 e- Oxidation HNO3 + 3 H+ +3 e- => NO + 2 H2O Reducti...
by ChenBeier
Tue Jul 27, 2021 11:38 pm
Forum: Chemistry forum
Topic: Electron-transfer reaction
Replies: 3
Views: 3791

Re: Electron-transfer reaction

Looks ok.
by ChenBeier
Tue Jul 27, 2021 10:35 am
Forum: Chemistry forum
Topic: Simple way to confirm 2% Sodium Hydroxide solution (NaOH)
Replies: 5
Views: 4255

Re: Simple way to confirm 2% Sodium Hydroxide solution (NaOH)

Some drops of a Standart indicator solution 0,1% in ethanol
by ChenBeier
Tue Jul 27, 2021 1:23 am
Forum: Chemistry forum
Topic: Simple way to confirm 2% Sodium Hydroxide solution (NaOH)
Replies: 5
Views: 4255

Re: Simple way to confirm 2% Sodium Hydroxide solution (NaOH)

Fill burette with 0.5 m HCl. The water is add that the Erlenmeyerflask can be shaked easier and to see the liquid. 10 ml NaOH will be not seen, the Level is to low. ((VHCl *cHCl/VNaOH)* MNaOH/Rho)*100% = c% Is VHCL = Volume of HCL yes cHCL = concentration of HCL yes VNaOH = Volume of Sodium hydroxid...
by ChenBeier
Mon Jul 26, 2021 3:14 pm
Forum: Chemistry forum
Topic: Simple way to confirm 2% Sodium Hydroxide solution (NaOH)
Replies: 5
Views: 4255

Re: Simple way to confirm 2% Sodium Hydroxide solution (NaOH)

Equippment Erlenmeyerflask 250ml and a Burette 25 ml, Pipette 10 ml HCl 0,5 n Phenolphthaleine indicator Add 10 ml NaOH into the erlenmeyer flask, add some drops indicator and add 20 ml water. Fill the burette with 0,5 n HCl Titration by shaking the Erlenmeyer flask until the solution turn from pink...
by ChenBeier
Sun Jul 25, 2021 6:29 am
Forum: Chemistry forum
Topic: Redox reactions
Replies: 6
Views: 5052

Re: Redox reactions

The final results are ok, I am wondering where the 2 H+ + 2e- comming from. Especially there is no acid in 1. and 2. Fe 2+ => Fe 3+ + e- Oxidation Ce 4+ +e - => Ce 3+ Reduction Fe 2+ + Ce 4+ => Fe 3+ + Ce 3+ Addition Sulfate is spectator ion For completion multiply by 2 and add SO4 2- 2 FeSO4 + 2 Ce...
by ChenBeier
Sat Jul 24, 2021 6:13 am
Forum: Chemistry forum
Topic: Redox reactions
Replies: 6
Views: 5052

Re: Redox reactions

If you wish to attach one or more files enter the details below. You may also attach files by dragging and dropping them in the message box. Maximum filesize per attachment: 1 MiB. You have to have jpg or PDF. For redox reaction use the redox pair law a) S2O3 2- / S4O6 2- and I2/I- 2 S2O3 2- => S4O6...
by ChenBeier
Sat Jul 24, 2021 2:50 am
Forum: Chemistry forum
Topic: Electron-transfer reaction
Replies: 3
Views: 3791

Re: Electron-transfer reaction

The basic is the law of faraday

m = I * t * c
c = electrochemical equivalent =M/ (z *F)

m= mass, I = current, t= time, M = molar mass, z = amount of transferred electrons, F = Faraday constant 96485 As,
by ChenBeier
Thu Jul 15, 2021 12:27 am
Forum: Chemistry forum
Topic: Buffer
Replies: 1
Views: 3265

Re: Carbonate and bicarbonate

Nothing happen.

pH = pKs - log((cHCO3-)/(cCO3 2-))
by ChenBeier
Mon Jul 05, 2021 10:58 am
Forum: Chemistry forum
Topic: Computing mass of CaF₂
Replies: 3
Views: 3903

Re: Computing mass of CaF₂

I think the amount is driven from the limiting agent. Ca 2+ is limited ion. Everything what is above the soloubilty will precipitate. Its about 2.38 g.