Estimation of Chloride in Water Sample for B.Sc. III Year Practical
Learn about the procedure for estimating chloride in a water sample using silver nitrate and potassium chromate indicators. The experiment involves titrating the sample with silver nitrate until a brick red color appears, indicating the presence of chloride ions. The calculation method for determining chloride concentration in mg/L is also explained. Join Manoj Joshi at UCoS, MLSU, Udaipur for this interesting practical session.
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Presentation Transcript
Estimation of Chloride in given Water Sample Class- B.Sc. III Year Practical Date: 08.10.2020 Time: 03:00-05:00PM Presented by Manoj Joshi Department of Zoology UCoS,MLSU, Udaipur.
Water contain chloride which react with silver nitrate and give white precipitate that shows quantitative presence of chloride in water. NaCl + AgNO3 AgCl +NaNO3 While entire chloride was precipitate then silver nitrate is freely react with the indicator potassium chromate and form silver chromate which gives brick red colour. Ag2CrO4 + 2KNO3 2AgNO3 + K2Cr2O4
Reagents:- i. 0.02N Silver Nitrate:- 3.4 gm AgNO3 + 1000 ml DW ii. 5% Potassium chromate:- 5 gm K2Cr2O4 + 100 ml DW Procedure:- Take 50 ml sample in a conical flask. Add 2 drop of Potassium chromate as indicator in sample holding flask. Fill the burette with fresh Silver nitrate solution carefully. Titrate the sample with Silver nitrate by genteelly shaking the flask till brick read colour appearance. Note the reading of burette and repeat the same process for three replica to get proper reading.
Observation table:- Burette Reading End Sample Vol. (ml) S. No Mean Start 0.0 0.0 0.0 Total 1 2 3 50 50 50 Calculation:- Chloride mg/L= A x N of AgNO3 X 1000 x 35.5 ml of sample = A x 0.02 x 1000 x 35.5 50 = A x 14.2 mg/L.
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