Chemistry Forum

The balanced reaction must be Co + 2 Cu 2+ => Co 2+ + 2 Cu+

Two electrons are transferred.

Silver carbonate will decompose in nitric acid. Silver nitrate and carbon dioxide will be obtained This has good solubility. Silver phosphate will in low pH got hydrogenphosphate and dihydrogenphosphate which is also better soluble.
Silver halogenides not soluble in acid.

Please use English 10) A sample of an alloy containing chromium, with a mass of 3,450 g, was dissolved in acid, and all the chromium in the sample was oxidized to CrO4-2 . It was then found that 3.18 g of Na2SO3 were needed to reduce CrO4-2 for CrO2-2 , in a basic solution, with oxidized SO3-2 conve...

2,5 mmol in 75 ml = 2,5mmol/75 ml = 0,033 mol/l = 0,033 M

In means Indicator. In- is the anion of indicator.

Its because the dissociation is like this. In neutral water 10^-7 H+ and also the same amount of OH- in solution.

Great Sounds Good.

Great, but it needs some explanation of the syntax how to do.

What happens to these two samples if you add only water?
Ca easily to find.

1. Show first, which ones are the redox pairs?
2. Reduction Add H+ hat H2O
3. Oxidation Zn to Zn 2+
4. Balance the charges with e-
5. Equality the electrons
6. Add both equations
7. Eliminate electrons, H+ and water if Impossible.

What happens if you Add to all samples HCl.
In Two samples you will observe something.
What happens if you add only water.

Of course you have to figure out of your own.
APO4 what is the oxidation Number of A. P and O must be known.

What is the oxidation number of A and Bn. Easily to see from the anions.
The _ of A is then oxn. B and the _ of Bn is oxn. A.

https://i.imgur.com/PM45ggD.png

It works without img

But the link is not valid anymore

There is no reaction. In water the both salts will dissociate in there ions. Na+, Cl- , K+ and Br-.