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1. DETERMINATION OF CHLORIDE CONTENT OF WATER

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1. DETERMINATION OF CHLORIDE CONTENT OF WATER SAMPLE BY
ARGENTOMETRIC METHOD
Aim :
To determine the chloride content of water sample by argentometric method.
(Mohr’s method).
Burette solution
Pipette solution
Indicator
End point
Titration 1
AgNO3
NaCl (20ml)
Potassium chromate
Yellow colour
changes to red
colour
Titration 2
AgNO3
Distilled water(50ml)
Potassium chromate
Titration 3
AgNO3
Water sample (50ml)
Potassium chromate
Yellow colour changes
to red colour
Yellow colour changes
to red colour
Result :
The amount of Chloride present in the given water sample= ------------- ppm.
2. CONDUCTOMETRIC TITRATION
(STRONG ACID Vs STRONG BASE)
Aim :
To find out the strength of acid (HCl) (approximately N/10), by titrating it against
sodium hydroxide solution conductometrically.
Burette solution
Pipette solution
End point
Model Graph:
NaOH
(50ml) HCl is taken in a 250 mL beaker
Note the conductance readings after each addition.
Result :
The strength of the given acid = ----------------- N
3. DETERMINATION OF STRENGTH OF HCl BY pH TITRATION
Aim :
To find out the strength of given hydrochloric acid solution by titrating it against
sodium hydroxide (0.1N) using pH meter.
Burette solution
NaOH
Pipette solution
20ml HCl is taken in a 250 mL beaker (100ml SMF)
Change in pH will be very much appreciable when the
End point
acid is neutralized
Result :
(i) Strength of the given hydrochloric acid solution = ---------- N
(ii) The amount of HCl present in the whole of the given Solution = ---------- g
4 . CONDUCTOMETRIC TITRATION OF MIXTURE OF ACIDS
Aim :
To find out the strength of mixture of acids of approximate strength N/10 each, by
titrating it against sodium hydroxide solution conductometrically.
Burette solution
NaOH
Pipette solution
HCl + CH3COOH (100ml SMF)
End point
Note the conductance readings after each addition.
Result :
The strength of each acid in the given mixture is
a. Hydrochloric acid = ---------------- N
b. Acetic acid = ---------------- N
5. ESTIMATION OF FERRIC ION BY SPECTROPHOTOMETRY
Aim :
To estimate the amount of ferric ion present in the given sample using
spectrophotometer.
Sl.No.
1
2
3
4
5
6
Vol.of Stock
Solution
(ppm)
2
4
6
8
10
unknown
Vol.of HNO3
(mL ) (1:1V)
3
3
3
3
3
3
Vol.of Potassium
Thiocyanate
(mL)
5
5
5
5
5
5
Vol.of
Distilled
water (mL)
90
88
86
84
82
unknown
Result :
The amount of iron present in the given test sample = ------------ ppm
Total
Volume
(mL)
100
100
100
100
100
100
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