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

No. ofobservation

Volume ofNaOH solutiontaken/ml

Burettereadine/ml

Volume of oxalicacid used/ml

Mean volume ofacid used / ml

Initial Final0l l0 7.0 27.7 20.702 10 1.9 22.7 20J / 20.8-03 10 22.8 43.3 20.5 ",/04 10 6.5 27.3 20.8 /

No. of observation Volume of sodium hydroxideadded/ml

Specific conductance, Lr/mS

0l 0.0 3.4902 0.2 3.4303 0.4 3.34o4 0.6 3.2305 0.9 3.0506 1.2 2.8907 t.4 2.7808 r.6 2.6609 1.9 2.5310 2.1 2.411t 2.3 2.5)12 2.6 2.rl

l3 2.8 2.04t4 3.2 1.81

l5 3.5 1.68

16 3.8 1.57

t7 4.t 1.43

18 4.4 1.36

t9 4.7 1.35

20 5.0 1.352l 5.3 t.3722 5.6 1.3423 5.9 1.3824 6.3 1,.39

25 6.7 1.4326 7.0 1.4527 7.4 1.4828 7.6 l.5l29 8.0 1.53

30 8.3 t.s63l 8.6 1.5932 8.9 t.62JJ 9.2 1.65

34 9.5 t.7735 9.8 r.8236 l0.l l.9t37 10.4 .2.04

38 10.8 2.1739 11.2 2.31

40 I 1.5 2.474t 11.9 2.6342 t2.3 2.7243 12.7 2.8844 13.0 3.0545 13.3 3.2246 13.6 3.3547 14.0 3.50

//

r

2. GRAPHS

Specificconductance/

mS

4

3.5

aJ

2.5

2

1.5

I

0.5

0

Specific Conductance vs Volume of NaOII

l"hI i i I i , I

i ilt i i I i , I

0 | 2 3 4 5 6 7 I 9 10 11 12 13 L4 15

Volume of NaOIVml

3. CALCULATION

(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 --

4. RESULT

o/o composition of hydrochloric acid : 35.8 %

oZ composition of acetic acid : 64.20/o