Molarity Investigation
Name__________________________________
http://phet.colorado.edu/en/simulation/molarity
Select “Show Values” and complete the table below as you change the “Solute Amount” and “Solvent
Volume.”
1.
Determine the maximum concentration possible for each substance. (Record the lowest amount of
moles needed to achieve the maximum concentration if it becomes saturated.)
Solute Name
Color
Maximum
Dissolved Solvent
Simplified ratio of
Concentration (M) moles
Volume (L)
moles/volume
Drink Mix
Cobalt(II) nitrate
Cobalt(II)
chloride
Potassium
dichromate
Potassium
chromate
Nickel(II)
chloride
Copper(II)
sulfate
Potassium
permanganate
2. What is the relationship between concentration and color for each solution observed as you raise
and lower the concentration with solute and/or solvent?
Concentration Exploration
Name__________________________________
http://phet.colorado.edu/en/simulation/concentration
A. Mixing Mass: Drag the concentration probe into the liquid. For each substance as a solid, add
enough to make the solution saturated. Then use the molar mass and volume to determine the
number of grams of solute that you added to the water
Solute Name
Formula
Molar Mass
Saturated
Moles = M x L
Mass of solute
(Xg/1mol)
Concentration
added=moles x
(M)
molar mass
Drink Mix
NA
NA
NA
NA
Cobalt(II)
nitrate
Cobalt(II)
chloride
Potassium
dichromate
Potassium
chromate
Nickel(II)
chloride
Copper(II)
sulfate
Potassium
permanganate
B. Dilutions: Drag the concentration probe into the liquid. For each substance as a solution, add
enough to double the volume. Use the dilution formula to determine the original concentration of
the added liquid.
Solute Name
Formula
Volume added, Total volume,
Final
Added
V1
V2
Concentration, Concentration,
C2
C1
Drink Mix
NA
Cobalt(II)
nitrate
Cobalt(II)
chloride
Potassium
dichromate
Potassium
chromate
Nickel(II)
chloride
Copper(II)
sulfate
Potassium
permanganate