Preparing Solutions and Dilutions Lab
Objectives:
Two skills that are
essential
to a chemist are preparing solutions of known molarity (M) and
diluting solutions of known molarity (M) to new, less concentrated solutions. As a basis for
understanding this concept, students will learn:
1) To accurately prepare a stock solution of known molarity.
2) To accurately dilute this solution to a new desired molarity.
Materials:
! (2) 100 mL volumetric
flask with caps
! Funnel
! Balance
! NaCl
! Tap water
! 10 mL graduated cylinder
! dropper
! small beaker filled with
water
Pre-Lab
1. Differentiate between the terms solute and solvent.
2. How many grams of AgNO3 are necessary to make 1.0 L of a 6.0 M stock solution?
3. How would you make 1.0 L of a 0.1 M solution of AgNO3 from your 6.0 M stock solution?
Name:
Date:
Per.
Molarity (M) = moles solute
L solution
Percent by Mass of solute = mass of solute x 100
mass of solution
Molarity by Dilution: M1V1 = M2V2
