Chemistry, 19.02.2020 04:26 drandbone92
A solution contains some or all of the ions Cu²⁺, Al³⁺, K⁺, Ca²⁺, Ba²⁺, Pb²⁺, and NH₄⁺. The following tests were performed, in order, on the solution.
1.Addition of 6 M HCl produced no reaction.
2.Addition of H₂S with 0.2 M HCl produced a black solid.
3.Addition of (NH₄)₂S produced a white solid.
4.Addition of (NH₄)₂HPO₄ in NH₃ produced no reaction.
5.The final supernatant when heated produced a purple flame.
Identify which of these ions were present in the solution (P), which were absent (A), and which were inconclusive (I)
a. Cu²⁺
b. Al³⁺
c. K⁺
d. Ca²⁺
e. Ba²⁺
f. Pb²⁺
g. NH₄⁺
Answers: 2
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