Question

A solution contains one or more of the following ions: Hg2 2+,Ba2+ ,Fe2+ and . When potassium chloride is added to the solution, a precipitate forms. The precipitate is filtered off and potassium sulfate is added to the remaining solution, producing no precipitate. When potassium carbonate is added to the remaining solution, a precipitate forms.Fe2+ and Hg2 2+ were present in the original solution.
Write net ionic equations for the formation of each of the precipitates observed.

Answer 1

Hg2^+2(aq) + 2Cl^-(aq) ==> Hg2Cl2(s)

iron carbonate is done the same way.

Answer 2

That's right!

Answer 3

A is a solution of tetraoxosulphate (vi) acid .B is a solution containing 1.4g of potassium hydroxide per 250cm cube (a) put A into the burette and titrate with 25cm cube portion of B using methy1orange or screened methy1orange as indicator . Record the volume of A used.(bi) concentration of B in mol.dm cube (bii) concentration of A in mol.dm cube (biii) Number of hydrogen in 1.0dm cube of A
(H=1,o=16,k=39, Avogadro constant =6.0*10 power of 23)