Use the data below to determine what cations are present in your unknown sample. You should use both the procedure and the flow chart to make your determinations. Cation lab data Upon adding NaOH the red litmus paper remains red. Upon adding HCl no precipitate is formed Now you add NaOH to your sample followed by hydrogen peroxide and a precipitate forms. You separate this into precipitate 5 and solution 5 To the above precipitate(5) you add HCl and hydrogen peroxide and notice the precipitate has disappeared. You then add ammonia and a precipitate forms. You separate the precipitate by centrifugation into precipitate 7 and solution 7. You then test the precipitate by adding HCl which solublilizies the precipitate, you then add ammonia and a precipitate forms. Upon addition of KSCN a blood red precipitate is formed. To solution 7 you add potassium acetate and acetic acid. You separate the resulting solution into 2 parts. To the first part you add potassium nitrite and a yellow precipitate forms. To the second part of the solution you add dimethyl glyoxime and you get a bright red precipitate. Now you move back to solution 5. You first add nitric acid to make acidic followed by ammonia to make basic. Once the solution is basic, you add barium chloride and notice that everything remains in solution. You then add HCl to make the solution acidic. Once acidic you then add K4Fe(CN)6 and notice that a bluish green precipitate forms.
Use the data below to determine what cations are present in your unknown sample. You should use both the procedure and the flow chart to make your determinations.
Cation lab data
Upon adding NaOH the red litmus paper remains red.
Upon adding HCl no precipitate is formed
Now you add NaOH to your sample followed by hydrogen peroxide and a precipitate forms. You separate this into precipitate 5 and solution 5
To the above precipitate(5) you add HCl and hydrogen peroxide and notice the precipitate has disappeared. You then add ammonia and a precipitate forms. You separate the precipitate by centrifugation into precipitate 7 and solution 7. You then test the precipitate by adding HCl which solublilizies the precipitate, you then add ammonia and a precipitate forms. Upon addition of KSCN a blood red precipitate is formed.
To solution 7 you add potassium acetate and acetic acid. You separate the resulting solution into 2 parts. To the first part you add potassium nitrite and a yellow precipitate forms. To the second part of the solution you add dimethyl glyoxime and you get a bright red precipitate.
Now you move back to solution 5. You first add nitric acid to make acidic followed by ammonia to make basic. Once the solution is basic, you add barium chloride and notice that everything remains in solution. You then add HCl to make the solution acidic. Once acidic you then add K4Fe(CN)6 and notice that a bluish green precipitate forms.
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