Separating Mixtures: Lab Experiments & Methods

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SUMMARY

The forum discussion focuses on the separation of a mixture containing NaCl, NH4Cl, and SiO2 through specific laboratory methods. The participant successfully sublimed NH4Cl, extracted NaCl via solubility in water, and dried SiO2 to achieve a constant mass. The participant questions the feasibility of altering the order of separation, concluding that separating solids from liquids first is essential for accurate measurement of solid weights.

PREREQUISITES
  • Understanding of sublimation and its application in separating NH4Cl.
  • Knowledge of solubility principles for extracting NaCl from a mixture.
  • Familiarity with drying techniques to achieve constant mass in solid samples.
  • Basic laboratory skills for conducting separation experiments.
NEXT STEPS
  • Research alternative methods for separating mixtures, such as centrifugation.
  • Learn about the principles of distillation for separating liquid components.
  • Explore the use of chromatography for complex mixture separation.
  • Investigate the impact of order of operations on separation efficiency in laboratory settings.
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Chemistry students, laboratory technicians, and educators involved in teaching separation techniques and methods in chemistry experiments.

osirisgeek
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Greetings,
I have just done a lab in which we separated NaCl, NH4Cl, and SiO2.

To separate first the mixture was heated and the Nh4Cl sublimed (in which i measured the content by mass loss)

Then I extracted the NaCl using soluability by adding water then evaporating the water leaving the Table salt to be weighed.

Last the wet Sio2 was left and it was just heated to get a constant mass.

Im trying to figure out if its possible to separate this in a different order, or will it not work properly. I am thinkings its not possible because you must first separate the solid and the liquid to properly measure the solids weight.

Does this seem right?
 
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by different order are you referring to, perhaps, dissolving the solid mixture in water first?
 

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