How would you test for so4 2- in an aqueous solution?

Answer :

The test for ion :

Procedure :

1) In a test tube, add 5-10 drops of aqueous solution of .

2) Add 1-2 ml of HCl solution and Barium chloride solution in the test tube.

The formation of white precipitate indicates the presence of ion.

The chemical reaction is,

The White precipitate of formed in this reaction.

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles