Solution Making 101
Step
1.
Define your solute and solvent
Example
2.
Determine what concentration you are trying to make in molar
(moles of solute / Liters of solvent)
3.
Look up the molar mass (grams / mole) of your solute
4.
Estimate how much volume you need of the solution throughout the whole experiment, in Liters (L)
5.
Solve for how many grams of solute you need to add using a three step factor-label method ( see below )
(see below)
Step 5 – Factor Label G.O. – include units and cancel them out!
Term 1 Term 2 Term 3
Desired conc.
(mol / L)
Molar mass of solute
(g / mol)
Desired volume (L)
Solve for
Mass of solute (g)
X X =
6. To make this solution, add _________ g of salt to ____________ ml of water.
Practice Problem: Ms. Capasso needs 50-ml of a 1.5M sucrose solution for each of her 4 lab classes this week.
Step
1.
Define your solute and solvent
Example
2.
Determine what concentration you are trying to make in molar
(moles of solute / Liters of solvent)
3.
Look up the molar mass (grams / mole) of your solute
4.
Estimate how much volume you need of the solution throughout the whole experiment, in Liters (L)
5.
Solve for how many grams of solute you need to add using a three step factor-label method ( see below )
(see below)
Step 5 – Factor Label G.O. – include units and cancel them out!
Term 1
Desired conc.
(mol / L)
Term 2
Molar mass of solute
(g / mol)
Term 3
Desired volume (L)
Solve for
Mass of solute (g)
X X =
6. To make this solution, add _________ g of sucrose to ____________ ml of water.

Pre-Lab Solution Planning
1.
What are the five concentrations you want to create? List in Molar (moles/L)
_______________________________________________________________
2.
What is the molar mass of the solute you chose? List in grams / mol: _______
3.
You will need about 250 ml of each solution in total for your entire experiment.
Determine the volume in Liters (L) : ________________________
4.
Use the method outlined on p.2 to solve for the amount of solute you need to add to this volume to get each concentration.
Term 1
Desired conc.
(mol / L)
Term 2
Molar mass of solute
(g / mol)
Term 3
Desired volume (L)
Solve for
Mass of solute (g)
X X =
X X =
X X =
X X =
X X =
5.
Fill in this table that will outline how to create your five solutions:
Desired concentration Volume of water in solvent Mass of solute added
Now get your math checked by your instructor!