Suppose that a student had a solution that may contain any or allof the followin

Question

Suppose that a student had a solution that may contain any or allof the following cations:Ag+,Pb2+,Fe3+, and Ni2+in an unknown mixture. The student adds HCl to the solutionand a precipitate forms. The student removes the precipitateand them adds NH4OH to the supernatant until it becomesbasic and a brown precipitate forms. Which cations arepresent in the precipitate? What cations are not present inthe original solution? (explain)

*The cations are in the from of a nitrate[Pb(NO3)2(aq) ,Fe(NO3)3(aq) ,Ni(NO3)2(aq) ,AgNO3(aq) ]

Explanation / Answer

The precipitate forms indicate that it may be PbCl2 andAgCl. So, these two ions are present in the solution. After the precipitate is removed, brown precipitates form. This maybe Fe(OH)3, which is brown in colour. Thus, it is deduced that Ni+ is not present in theoriginal solution as it doesn't seem to be involved in anyreactions above. Hope this helps!

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

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