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Course No: Chem 352 Date of perforrnance: 19/01/14Course Title: Instrumental Methods of Analysis Sessional Group No: 06 (A-2)
Group members ID: 10020451002053t00205710020580402043
Experiment No: 03Name of the experiment: Conductometric titration of mixture of acetic acid andhvdrochloric acid by sodium hvdroxide solution
1. OBSERYED DATA
Table 01: Observed data for standardization of sodium hvdroxide bv oxalic acid
Table 02: Observed values of specific conductance and volume of sodium hvdroxidesolution added
(a) Concentration of sodium hydroxide solution:Volume of oxalic acid, Vz:20.8 ml (from table 0l)Strength of oxalic acid, Sz:0.1 NVolume of sodium hydroxide taken, Vr = 10 mlStrength of sodium hydroxide, Sr : ?
Now,V1 xS1 :VzXSz ,
20.8 mlx0.1NSr:10 ml
:0.208 N
(b) Concentration of hydrochloric acid:
Volume of sodium hydroxide solution required to neutralize hydrochloric acid ,
Yz:4.5 ml (from graph)
Strength of sodium hydroxide , Sz:0.208 NVolume of hydrochloric acid taken , Vr : 10 mlStrength of hydrochloric acid, Sr : ?
Now,V1 x51 :V2X52
4.5 mlx0.2oBNSr:10 ml
:0.0936 N
(c) Mass of hydrochloric acid:
Mass of hydrochloric acid, msq: (SeV)g61:1O0O ml
:0.0342 g
(d) Concentration of acetic acid:
Volume of sodium hydroxide solution required to neutralize acetic acid,Vz = ( 9.4 - 4.5)ml- 4.9 ml (from graph)
$-Sength of sodium hydroxide , Sz :0.208 N
ic acid, Sr : ?
ix Sr:VzXSz
4.9 mlx0.208NSr:10 ml
= 0.102 N
0.0936Nx36.5 g x10 ml
(e) Mass of acetic acid:
Mass of acetic acid, TttcH3coon: (SeV)sHrcooH:0.102Nx609x10m1
1000ml:0.0612g
(f) Percentage composition of hydrochloric acid and acetic acid in the mixture:
Total mass of mixture, Mr : rrncr * IIICHTCO6g : (0.0342 + 0.0612) g: 0.09549
o/o composition of hydrochloric acid: Yx 100% :35.8yo0.09549
,./
o/o composition of acetic acid :W:x L00o/o = 64.20/o0.09549 --