1. DETERMINATION OF CHLORIDE CONTENT OF WATER SAMPLE BY ARGENTOMETRIC METHOD Aim : To determine the chloride content of water sample by argentometric method. (MohrвЂ™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