Transcribed Image Text: Ammonium sulfate is added to an unknown mixture of ions. No precipitate forms. Ammonium oxalate is then added and a precipitate forms.
Transcribed Image Text: Ammonium sulfate is added to an unknown mixture of ions. No precipitate forms.
Ammonium oxalate is then added and a precipitate forms. The solution is
centrifuged, and the remaining solution is decanted. Sodium monohydrogen
phosphate and sodium hydroxide are added to the decanted solution, and no
precipitate forms. Sodium hydroxide is added to a fresh sample of the unknown. A
damp piece of litmus paper over the opening of the test tube turns blue.
Select the ions present.
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