## Search found 749 matches

Wed Apr 21, 2021 9:05 am
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?

pH 1.27 is for 0.1 mol/l not for 1 mol/ l
Mon Apr 19, 2021 10:01 pm
Forum: Chemistry forum
Topic: HELP! Mechanism for formation of Br2 from H2O2 and HBR
Replies: 1
Views: 60

### 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
Mon Apr 19, 2021 9:58 pm
Forum: Chemistry forum
Replies: 1
Views: 98

Check for redox reaction of Permanganate and oxalic acid. Discussed several times. Bariumsulfat is spectator.
Mon Apr 19, 2021 11:23 am
Forum: Chemistry forum
Topic: How to convert PPB to molarity?
Replies: 6
Views: 123

### 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.
Mon Apr 19, 2021 10:20 am
Forum: Chemistry forum
Topic: How to convert PPB to molarity?
Replies: 6
Views: 123

### 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.
Mon Apr 19, 2021 8:15 am
Forum: Chemistry forum
Topic: How to convert PPB to molarity?
Replies: 6
Views: 123

### 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.
Mon Apr 19, 2021 3:18 am
Forum: Chemistry forum
Topic: Name the substance
Replies: 5
Views: 150

### Re: Name the substance

3(R),7- Dimethyl-cis-oct-6-en-1-al
Mon Apr 19, 2021 3:15 am
Forum: Chemistry forum
Topic: Balance Equation
Replies: 1
Views: 113

### 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+
Sun Apr 18, 2021 9:54 pm
Forum: Chemistry forum
Topic: Why doesn't Si + Wo3 ignite?
Replies: 2
Views: 114

### 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.
Sun Apr 18, 2021 4:28 am
Forum: Chemistry forum
Topic: What happens when you mix Hypochlorous Acid and Vinegar?
Replies: 3
Views: 137

### 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
Sun Apr 18, 2021 12:18 am
Forum: Chemistry forum
Topic: acid base titration
Replies: 1
Views: 88

### Re: acid base titration

Google how to calculate pH of ammonium chloride and sodium acetate.

Sat Apr 17, 2021 6:14 am
Forum: Chemistry forum
Topic: Chemistry
Replies: 1
Views: 92

### Re: Chemistry

The amount of HNO3 is not given. So not possible to calculate.

1. Develop the chemical equation, what is the product?
2. Read how much mole Al2O3 correspond to that product
3. How many mole of HNO3 you need?
4. If amount of HNO3 given then you can calculate the waste by difference.
Sat Apr 17, 2021 3:25 am
Forum: Chemistry forum
Topic: What happens when you mix Hypochlorous Acid and Vinegar?
Replies: 3
Views: 137

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

To add other acid to HOCl it will change pH. The HOCl get more aggressive and releasing Oxygen, in small amounts also Chlorine. The smell is similar to swimmingpool water.
Fri Apr 16, 2021 8:22 am
Forum: Chemistry forum
Replies: 1
Views: 149