Calculations: Volume of sodium hydroxide at the end point (from graph) = V2 = …..ml N1V1 (HCl) = N2V2 (NaOH) N2 (NaOH) = ……………… Mass of NaOH in given solution = N2 × Equivalent Weight of NaOH =…………g / l
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EXPERIMENT: ESTIMATION OF SODIUMHYDROXIDE USING HYDROCHLORIC ACID (CONDUCTOMETRIC TIITRATION)
Aim: To determine the mass of NaOH in the given solution by conductance measurement.
Apparatus & Chemicals: 0.1N, 100 ml HCl , weighing balance, burette, pipette, beaker, funnel, standard flask, glass rod, distill water
Theoretical Background: When sodium hydroxide is added to HCl, the highly mobile H+ ions are replaced by less mobile metallic ions.
Before the alkali is added, the acid solution has a high conductance due to the highly mobile H+ ions.
Observations:
|
Volume of NaOH added (ml) |
Conductance |
Volume of NaOH added (ml) |
Conductance |
|
1 |
5.5 |
13 |
1.3 |
|
2 |
5.3 |
14 |
1.0 |
|
3 |
5.1 |
15 |
0.7 |
|
4 |
4.6 |
16 |
0.4 |
|
5 |
4.2 |
17 |
0.1 |
|
6 |
3.8 |
18 |
0.5 |
|
7 |
3.3 |
19 |
0.9 |
|
8 |
2.9 |
20 |
1.2 |
|
9 |
2.6 |
21 |
1.7 |
|
10 |
2.2 |
22 |
2.2 |
|
11 |
1.9 |
23 |
2.5 |
|
12 |
1.6 |
24 |
2.9 |
Calculations:
Volume of sodium hydroxide at the end point (from graph) = V2 = …..ml
N1V1 (HCl) = N2V2 (NaOH)
N2 (NaOH) = ………………
Mass of NaOH in given solution = N2 × Equivalent Weight of NaOH
=…………g / l
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