A.Determination of Mass Percent of Ammonium Chloride — 
Mass of evaporating dish and original sample  _________
Mass of evaporating dish     _________
Mass of evaporating dish after subliming NH4Cl  ________
Mass of NH4Cl   _______
Percent of NH4Cl (show calculations)
 Use these data 
  A.Determination of Mass Percent of Ammonium Chloride — 
Mass of evaporating dish and original sample  15.1650 g
Mass of evaporating dish     12.5230 g
Mass of evaporating dish after subliming NH4Cl  14.6589g
Mass of NH4Cl   _______
Percent of NH4Cl (show calculations)

  
. Determination of Mass Percent of Sodium Chloride
— 
Mass of evaporating dish, watch glass and NaCl _____
Mass of evaporating dish and watch glass _____ 
Mass of NaCl  _____
Percent of NaCl (show calculations) _____
 Use these data 
  
Determination of Mass Percent of Sodium Chloride
— 
Mass of evaporating dish, watch glass and NaCl 17.4967 g
Mass of evaporating dish and watch glass 16.7686 g
Mass of NaCl  _____
Percent of NaCl (show calculations) 

  
. Determination of Mass Percent of Silicon Dioxide
Mass of evaporating dish and SiO2  _____
Mass of evaporating dish    _____
Mass of SiO2  _____
Mass percent of SiO2 (show calculations) _____

  
. Determination of Mass Percent of Silicon Dioxide
Mass of evaporating dish and SiO2  13.8354 g
Mass of evaporating dish    12.5230 g
Mass of SiO2  _____
Mass percent of SiO2 (show calculations) _____

  
. Determination of Percent Recovery
Mass of original sample _____
Mass of determined (NH4Cl + NaCl + SiO2)   _____
Difference in these weights _____
Percent recovery = g matter recovered/g original sample x 100%
_____
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