Search found 749 matches

by ChenBeier
Tue Apr 27, 2021 9:22 am
Forum: Chemistry forum
Topic: Titration and pH computation
Replies: 17
Views: 264

Re: Titration and pH computation

Indicator pH must be around +- 1 pH around equivalent point. Strong acid and strong Base means pH 6 to 8. Phenol red would be fine 6.4 - 8.2
Bromine thymolblue, neutral red,rosol acid, m-nitrophenol also possible.
by ChenBeier
Tue Apr 27, 2021 7:50 am
Forum: Chemistry forum
Topic: Titration and pH computation
Replies: 17
Views: 264

Re: Titration and pH computation

Please be aware that M is a concentration and not the same like moles. You mix it up.
The solution is 0,1 M equal to 0,1 mol/ l. The moles in 50 ml is 0.005 mol and not 0.005 M.
by ChenBeier
Sun Apr 25, 2021 1:58 am
Forum: Chemistry forum
Topic: ANALYTICAL SCIENTIST
Replies: 1
Views: 113

Re: ANALYTICAL SCIENTIST

by ChenBeier
Sat Apr 24, 2021 12:17 am
Forum: Chemistry forum
Topic: AYUDA CON EL BALANCEO DE LA SIGUIENTE ECUACIÓN
Replies: 1
Views: 76

Re: AYUDA CON EL BALANCEO DE LA SIGUIENTE ECUACIÓN

Again use english here.
This equation make no sense.
by ChenBeier
Fri Apr 23, 2021 10:51 am
Forum: Chemistry forum
Topic: Molarity, weight %, Molality and other variables of solution
Replies: 3
Views: 114

Re: Molarity, weight %, Molality and other variables of solution

a) 0,194 M
b) 1,79% w.w
c) 0,12 mmol/kg
d) 0,019
The Rest its your job.
by ChenBeier
Fri Apr 23, 2021 10:38 am
Forum: Chemistry forum
Topic: Finding out unknown compound in the solution and boiling point of the solution
Replies: 7
Views: 139

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

Yes its correct. But cannot say which compound it is. For this need more analysis, like NMR , IR, UV/ Vis spectra and elementar analysis of C, H, N,O, maybe Halogen.
As suggested it cannot be a metal like tin.
by ChenBeier
Fri Apr 23, 2021 6:55 am
Forum: Chemistry forum
Topic: Sobre Equilíbrio Químico - ajude-me
Replies: 1
Views: 72

Re: Sobre Equilíbrio Químico - ajude-me

Use english

About the chemical equilibrium - help-me

An aqueous solution of 0.2 mol / L ammonium chloride contains a degree of hydrolysis equal to 0.5%. Determine [H +], [OH -], pH, pOH and Kh for that solution and or Kb for NH4OH.
Given: Kw = 10–14, at 25 ° C.
NH4 + + H2O ⇌ NH4OH + H +
by ChenBeier
Fri Apr 23, 2021 6:50 am
Forum: Chemistry forum
Topic: Solubilidade entre AgCl e NaOH
Replies: 1
Views: 54

Re: Solubilidade entre AgCl e NaOH

English please

solubility between AgCl and NaOH

As explained, the solubility of AgCl on a base fails as NH4OH and not on a strong base such as NaOH or KOH

Not true

https://en.m.wikipedia.org/wiki/Silver_chloride

Silverchloride is easily devolved in ammonia by complex foundation.
by ChenBeier
Thu Apr 22, 2021 11:22 pm
Forum: Chemistry forum
Topic: Have I Inadvertently created nickel acetate
Replies: 2
Views: 84

Re: Have I Inadvertently created nickel acetate

Probably. Nickel react with every acid.
But dont worry its only small amount, clean everything with a brush and normal household cleaner should be fine.
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: 139

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: 49

Re: Zbilansowanie aspiryny