Question

6. 6 M HCl is added to a solution of Ag , Cu2 , Fe3 . A white precipitate forms. Predict which ions are present. Make sure you explain and justify your answer.

Answer 1

`Ag^(+)` is present in solution

Step-by-step explanation:

In presence of HCl, metal ions present in solution will be precipitated as metal chloride provided these salts are either insoluble or sparingly soluble in water.

According to solubility rule, all chlorides are soluble except AgCl,
`PbCl_(2)` and
`Hg_(2)Cl_(2)`

In all probability, addition of HCl in solution will result formation of AgCl,
`CuCl_(2)` and
`FeCl_(3)`. But only AgCl is insoluble. Hence it will get precipitated out of solution.

So,
`Ag^(+)` is present in solution

Balanced reaction:
`Ag^(+)(aq.)+Cl^(-)(aq.)\rightarrow AgCl(s)`