OBSERVATIONS 
1. Preparation of 250 mL M/80 standard Na2CO3 solution

Mass, w of Na2CO3 to be weighed for the preparation of solution 
w = 1 x 106 x 250 = 0.3312 g
80 x 1000


Mass of empty weighing bottle = X = 

Mass of weighing bottle and Na2CO3 = Y = 

Mass of weighing bottle after transfer = Z = 

Actual mass of Na2CO3 transfer = w1 = (yz) = 
0.0000 g 
2. Titration of standard Na2CO3 solution against HCl

 Solution in burette = HCl  
 Solution in titrating flask = V1= 20 mL standard Na2CO3  
 Indicator used = methyl orange  
 End point = yellow to orange  

S.No. 
Burette reading 
Volume of HCl used 
Initial 
Final 
1 



2 



3 



Concordant volume (V2) : 
mL 
3. Titration of given Na2CO3 solution against HCl solution.

 Solution in burette = HCl  

Solution in titrating flask = V3=20 mL of given Na2CO3 solution 

 Indicator used = methyl orange  
 End point = yellow to orange  

S.No. 
Burette reading 
Volume of HCl used 
Initial 
Final 
1 



2 



3 



Concordant volume (V4) : 
mL 
CALCULATIONS 
1. Molarity of standard Na_{2}CO_{3} solution: 
M1 = 
w_{1} x 1000/(molar mass x V) 
M1 = 
0.0000 x 1000/106 x 250 
M1 
0.0000 M 
2. Molarity of given HCl solution: 
M1 V1 / n1 = 
M1 V1 / n1 
(Standard Na2CO3)
n1 = 1; 
(HCl) n2 = 2 
M2 = 
M1 x V1 x n2
V2 x n1

M2 = 
M 
3. Molarity of given Na_{2}CO_{3} solution 
M3 V3 x 2 = 
M2 V4 x 1 
(Given Na2CO3) 
(HCl) 
M3 = 
M2 x V4
2v3

M3 = 
M 
Strength of the given Na_{2}CO_{3} will therefore be = M_{3} x 106 =

RESULT 
The Strength of given Na2CO3 solution is =
g L^{1} 

