## Search found 749 matches

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.
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.
Sun Apr 25, 2021 1:58 am
Forum: Chemistry forum
Topic: ANALYTICAL SCIENTIST
Replies: 1
Views: 113

### Re: ANALYTICAL SCIENTIST

Sat Apr 24, 2021 2:13 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

Ok
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.
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
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.
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 +
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

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.
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.
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.
Thu Apr 22, 2021 11:16 pm
Forum: Chemistry forum
Topic: How to compute pH of ((COOH)2) Oxalic acid?
Replies: 3
Views: 96

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

Thu Apr 22, 2021 8:59 am
Forum: Chemistry forum
Topic: Zbilansowanie aspiryny
Replies: 1
Views: 49

### Re: Zbilansowanie aspiryny

Thu Apr 22, 2021 7:46 am
Forum: Chemistry forum
Topic: Finding out unknown compound in the solution and boiling point of the solution
Replies: 7
Views: 139