Question

An unknown that might contain any of the elght lons studied in this experiment but no other loux) has the following properties On adition of 1 MHCI, bubbles form. . When I MB , le added to the acidified unknow, a white precipitats results, e. When I MANO, Ia added to the unknown, clear solution recull On the basis of the preceding Information, clasally each of the following lone w present (P), absent (A), or undetermined (U) by the tests described: Co,-_ 0,1- SCN" 4- 1 AB+ Cu2+ Folt PO-

Answer 1

Solution:

The given test are performed for the analysis of anion.

1) Addition of 1M HCl

Bubbles forms which confirms the evolution of CO2 gas.

Hence, CO3^2- present.

2) BaCl2 test

Confirms the formation of white precipitate of BaSO4.

Hence, SO42- present.

3) Addition of AgNO3

If Cl- or SCN- ions are present, it gives white precipitate.Since, a clear solution is observed, hence confirms the absence of both Cl- ans SCN-.

Hence, Cl- and SCN- absent.

Thus,

CO3^2- = P

SO4^2- = P

Cl- = A

SCN- = A

Fe3+ = U

Cu2+ = U

Al3+ = U

PO43- = U