Question

A solution was known to contain both Ag+ ions and Ni2+ ions? Which of the following could be added to separate them in such a way that one ion would end up in a precipitate, while the other remained in solution. (1) HCl ; (2) H2SO4 ; (3) K2CrO4 ; (4) NH4OH; (5) none of the previous substances could separate these ions.

Answer 1

TO the sample by addition of HCl, precipitation of the Ag^+(Group I metal chlorides), and separation of the solid precipitate from the remainder of the solution, which contains the dissolved Group Ni^+2 ions.

cofirmation of Ag^+

Silver forms a soluble complex ion with aqueous ammonia. The presence of silver is confirmed by dissolving any remaining solid residue in 6 M NH₃ (aq) and then re-precipitating the chloride by freeing the silver ion from the complex ion using 6 M acid.

therfore answer is 1) HCl     4) NH4OH