MHS Chemistry
Separation of a Mixture of Solids
Purpose
In this lab you will develop a scheme to separate a mixture of three
pure solids. You will also determine the % composition of the original
mixture.
Procedure
-
Examine the physical properties of the three solids. Based on these
properties, develop a procedure to separate them one at a time, in order
to determine the amount of each present in a sample. When you have
come up with a procedure, check with your instructor to make sure it's
OK to begin. Try to start with about two to two-and-a-half grams
of the mixture.
-
Record all data necessary in a proper data table, with descriptions, labels,
and the proper number of decimal places.
-
None of the materials requires special disposal.
Data
Organize your data into a proper table in your notebook.
When you are satisfied that it is complete, copy it onto a clean sheet
to pass in as part of your lab report.
Physical Properties
| |
Color
|
MP (C)
|
Sol. in Water
|
Density (g/mL)
|
|
NaCl
|
white
|
804
|
yes
|
2.17
|
|
NH4Cl
|
white
|
340 (sublime)
|
yes
|
1.5274
|
|
SiO2
|
white/brown
|
1865
|
no
|
2.65
|
Calculation
-
Remember to show every single calculation as a description (with words)
and as numbers with labels. The descriptions should be on the same
row as the corresponding numbers.
-
Calculate the mass of NaCl, NH4Cl, and SiO2
present.
-
Calculate the precentage of mass from NaCl, NH4Cl,
and SiO2 present.
-
Remember to show all labels and calculations!
[Separation of Solids score sheet][Chapter
2 Notes][MHS Chem page]