Preparation of sodium carbonate (Na2CO3) and potassium chloride (KCl) solutions
And dilution of HCl solution
Objectives:
In this experiment the student will be able to prepare different concentrations of several
salts and dilute the concentrated solutions
Introduction
In this experiment we will deal with solution stoichiometry. The concentration of a
solution is the amount of solute present in a given quantity of solvent or solution.
M = molarity = moles
Volume (L)
Example 1: What mass of KBr is required to make 100. ml of a 1.50 M KBr solution? (molar
mass = 119 g/ mol)
Moles = M X Vol. = 1.50 X 0.100 = 0.15 mol
Mass = moles X molar mass = 0.15 X 119 = 17085 g
Example 2: How would you prepare 80.0 mL of 0.100 M HCl from a stock solution of 2.00
M HCl
MiVi = MfVf
2.0 X Vi = 0.1 X 80
Vi = 4.0 ml = 0.004 L
Procedure:
A) Preparation of 250 ml of 0.1 M Na2CO3 and KCl solutions:
1- Determine the mass of Na2CO3 and KCl salts
2- Weigh accurately the calculated mass of salts
3- Transfer your mass into 250 ml volumetric flask
4- Complete the volume of the flask with distilled water
B) Dilution: preparation of 250 ml of 0.2 M HCl solution from 1.0 M HCl solution
1- Determine the volume of HCl that must be diluted
2- Pipet the calculated volume from the stock solution
3- Transfer it into 250 ml volumetric flask
4- Complete the volume with distilled water
Experiment Five: Preparation of sodium carbonate (Na2CO3) and potassium chloride (KCl)
solutions And dilution of HCl solution
Results and Calculations
ID:
Student name:
Instructor:
Section:
A) 1- Preparation of 250 ml of 0.1 M Na2CO3 solution:
Sidium carbonate Na2CO3
Molarity
Volume
Moles
Mass
Trial 1
0.1 M
250 ml
Trial 2
Calculations:
2- Preparation of 250 ml of 0.1 M and KCl solutions:
Sidium carbonate Na2CO3
Molarity
Volume
Moles
Mass
Trial 1
0.1 M
250 ml
Trial 2
Calculations:
B) Dilution: preparation of 250 ml of 0.2 M HCl solution from 1.0 M HCl solution
Hydrochloric acid HCl
Final concentration (molarity)
Final volume
Initial concentration ( molarity)
Initial volume
Calculations:
Trial 1
0.2 M
250 ml
1.0 M
Trial 2