Search found 739 matches

by ChenBeier
Thu Apr 29, 2021 12:32 am
Forum: Chemistry forum
Topic: Titration and pH computation
Replies: 17
Views: 157

Re: Titration and pH computation

No, its a weak base so you have to calculate with HENDERSON Hasselbalch equation.
by ChenBeier
Wed Apr 28, 2021 8:28 am
Forum: Chemistry forum
Topic: Titration and pH computation
Replies: 17
Views: 157

Re: Titration and pH computation

Now its correct. What is your opinion to trifluorine acetic acid.
by ChenBeier
Wed Apr 28, 2021 7:28 am
Forum: Chemistry forum
Topic: Titration and pH computation
Replies: 17
Views: 157

Re: Titration and pH computation

a) is now wrong, why you changed to 0,00525
You have 50 ml + 25 ml = 75 ml = 0,075 l
b) is wrong too
by ChenBeier
Wed Apr 28, 2021 3:04 am
Forum: Chemistry forum
Topic: Definition of equivalent weight
Replies: 1
Views: 26

Re: Definition of equivalent weight

Yes it is. It guides from molarity to normality or equivalent concentration.
Compare HCl and H2SO4 , if neutralised with 1 M NaOH.
by ChenBeier
Wed Apr 28, 2021 2:55 am
Forum: Chemistry forum
Topic: Titration and pH computation
Replies: 17
Views: 157

Re: Titration and pH computation

a is correct
b no. Check properties of Trifluorine acetic acid.
c yes
by ChenBeier
Tue Apr 27, 2021 9:22 am
Forum: Chemistry forum
Topic: Titration and pH computation
Replies: 17
Views: 157

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: 157

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: 86

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: 52

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: 84

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: 102

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: 49

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: 35

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: 52

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.