An aqueous solution contains two or more of the following cations: Ag^+, Al^3+,

Question

An aqueous solution contains two or more of the following cations: Ag^+, Al^3+, Fe^3+. Mn^2+, NH^+_4, Ni^2+, Pb^2+. The sample was tested with the cation classification scheme used in Experiment #14. The solution was clear and a slightly yellow color. Treating the solution with 6M NaOH did not produce gas but did produce a light brown precipitate. Treating the solution with 6M HCI produced a white precipitate. The precipitate above dissolved in hot water but did not dissolve in 6M NH_3 When the dissolved precipitate is treated with 3 M H_2SO_4. a white precipitate formed. When the dissolved precipitate is treated with K2Cr04, a yellow precipitate formed Treatment of the supernatant liquid with excess 6M NaOH produced a dark brown precipitate. This precipitate did not dissolve in 6M NH_3 Heating the precipitate with a mixture of 3M H_2SO_4 and 3% H_2O_2 dissolved the precipitate to form a light yellow solution The supernatant liquid from the 6M NaOH precipitation was made acidic with 3M H_2SO_4. When aluminon dye and 6M NH_3 were added, a red solution with a pinkinsh precipitate formed. Which cations are present in the unknown solution and which cations are not present in the unknown solution?

Explanation / Answer

lets check test by test:

present ions in the unknown are, Pb Al Fe

absent ions are: NH4+, Ag+ Ni+ Mn+

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.