Question 1
Which metal sulfides can be precipitated from a solution that is 0.01 M in Mn
2+, Zn
2+, Pb
2+ and Cu
2+ and 0.10 M in H
2S at a pH of 0.50?
◦ CuS
◦ ZnS, PbS, CuS
◦ PbS, CuS
◦ MnS
Question 2
A solution may contain the following ions Ag
+, Cu
2+, Cd
2+, Mn
2+, Ni
2+ and Na
+. A white precipitate formed when 0.10 M NaCl was added and after this was removed the solution was treated with H
2S gas under acidic conditions and no precipitate formed. When the solution was made basic and again treated with H
2S gas a dark colored precipitate formed. If no further tests were made then what conclusions can you draw?
◦ possible ions present Ag
+, Mn
2+, Ni
2+, Na
+◦ possible ions present Ag
+, Cu
2+, Cd
2+, Na
+◦ possible ions present Ag
+, Mn
2+, Ni
2+◦ possible ions present Ag
+, Cu
2+, Cd
2+
White lion in Belgrade Zoo, Serbia.
Desert cottontail as seen from behind such that the white tail is easily visible
Polyatomic Ions
Which of the buffers below would be the BEST choice for making a solution capable of buffering ...