### Description

__some of the answers for the report sheet are in this description:__

Watch the following video to get an idea of what the experiment looks like – although there are some differences in our procedure.

**A. Determination of Mass Percent of Ammonium Chloride**

Fill in the following on your report sheet:

Mass of evaporating dish and original sample: **54.85 g**

Mass of evaporating dish: **52.31 g**

Mass of original sample: *(determine on your own)*

Mass of evaporating dish (and sample) after subliming NH_{4}Cl: **54.73 g**

Mass of NH_{4}Cl: *(determine on your own)*

Percent of NH_{4}Cl: *(determine on your own, see the equation in Example 2.1)*

**B. Determination of Mass Percent of Sodium Chloride**

Fill in the following on your report sheet:

Mass of evaporating dish, watch glass, and NaCl: **64.36 g**

Mass of evaporating dish and watch glass: **63.83 g**

Mass of NaCl: *(determine on your own)*

Percent of NaCl (show calculations): *(determine on your own, see the equation in Example 2.1)*

**C. Determination of Mass Percent of Silicon Dioxide**

Fill in the following on your report sheet:

Mass of evaporating dish and SiO_{2}: **54.26 g**

Mass of evaporating dish: **52.31 g**

Mass of SiO_{2}: *(determine on your own)*

Percent of SiO_{2} (show calculations): *(determine on your own, see the equation in Example 2.1)*

**D. Determination of Percent Recovery**

All of Part D. on the report sheet: *(determine on your own)*

******************************************************************************************

Instructors: Please change the data from class to class

**A. Determination of Mass Percent of Ammonium Chloride**

Mass of evaporating dish and original sample | 45.386 g |

Mass of evaporating dish | 42.694 g |

Mass of original sample | |

Mass of evaporating dish after subliming NH_{4}Cl | 44.992 g |

Mass of NH_{4}Cl | |

Percent of NH_{4}Cl (show calculations) |

**B. Determination of Mass Percent of Sodium Chloride**

Mass of evaporating dish, watch glass, and NaCl | 98.580 g |

Mass of evaporating dish and watch glass | 97.526 g |

Mass of NaCl | |

Percent of NaCl (show calculations) |

**C. Determination of Mass Percent of Silicon Dioxide**

Mass of evaporating dish and SiO_{2} | 43.902 g |

Mass of evaporating dish | 42.694 g |

Mass of SiO_{2} | |

Percent of SiO_{2 }(show calculations) |

**D. Determination of Percent Recovery**

Mass of original sample | |

Mass of determined (NH_{4}Cl + NaCl + SiO_{2}) | |

Differences in these welghts | |

Percent recovery of matter = g matter recovered /g original sample x 100% = | |

Account for your errors |

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