Business

Qualitative Cations Lab Name

Data Table

|Cation |Test Tube1(HCL) |NH3 |Test Tube2(NaOH) |Excess |Test Tube3(NH3) |Excess |Confirmation |

|Ag+ |White ppt. |Ppt. dissolves|Brown ppt. |Ppt. is |Brown ppt. |Ppt. dissolves|Add HCl, until a ppt. |

| | | | |insoluble | | |forms. Ppt. dissolves in |

| | | | | | | |aq. NH3. Ppt. reappears on|

| | | | | | | |addition of HNO3. |

|Pb2+ |White ppt |Ppt. is |White ppt |Ppt. dissolves|White ppt |Ppt. is |Add a few drops of |

| | |insoluble | | | |insoluble |potassium chromate(1M |

| | | | | | | |K2CrO4) --- Yellow ppt. |

| | | | | | | |PbCrO4 |

|Cu2+ |---- |---- |Blue ppt. |Ppt. is |Blue ppt |Ppt. dissolves|Acidify with one drop of |

| | | | |insoluble | | |HCl(6M) and add one drop |

| | | | | | | |of Potassium |

| | | | | | |...