The following reagents are required to measure the chloride.
Solutions:
1- Standard AgNO3 solution (1N): 84.5g of AgNO3 dissolve in distilled water and dilute to 1000 ml.
2- Standard AgNO3 Solution (0.014 N): 1.183 g of AgNO3 dissolve in distilled water and dilute to 1000ml.
3- Standard Sodium Chloride (0.014 N): 819 mg NaCl crystal dissolve in distilled water and dilute to 1000 ml.
4- Potassium Chromate indicator: Dissolved 50 g K2CrO4 in distill water, added AgNO3 solution till a definite red precipitate, is formed. Equilibrate for 12 hours, filter and dilute to 1000ml with distilled water.
5- Hydrogen per oxide H2O2 30%.
Procedure:
AgNO3 solution is standardize against standard sodium chloride solution.30 ml of sample is taken in a conical flask. Then added 1 ml H2O2 30% and 1ml K2CrO4, then titrate against 0.014 N AgNO3 to a pinkish yellow end point
Calculation:
Chloride mg/L = (A – B) x N x 1000 / ml of sample.
A = ml of titrant used
B= ml of titrant for blank
N= normality of AgNO3
All the readings are to be calculated and compiled in tabular form. Then there mean is found. We analyze this parameter both for drinking water and sewage.
Solutions:
1- Standard AgNO3 solution (1N): 84.5g of AgNO3 dissolve in distilled water and dilute to 1000 ml.
2- Standard AgNO3 Solution (0.014 N): 1.183 g of AgNO3 dissolve in distilled water and dilute to 1000ml.
3- Standard Sodium Chloride (0.014 N): 819 mg NaCl crystal dissolve in distilled water and dilute to 1000 ml.
4- Potassium Chromate indicator: Dissolved 50 g K2CrO4 in distill water, added AgNO3 solution till a definite red precipitate, is formed. Equilibrate for 12 hours, filter and dilute to 1000ml with distilled water.
5- Hydrogen per oxide H2O2 30%.
Procedure:
AgNO3 solution is standardize against standard sodium chloride solution.30 ml of sample is taken in a conical flask. Then added 1 ml H2O2 30% and 1ml K2CrO4, then titrate against 0.014 N AgNO3 to a pinkish yellow end point
Calculation:
Chloride mg/L = (A – B) x N x 1000 / ml of sample.
A = ml of titrant used
B= ml of titrant for blank
N= normality of AgNO3
All the readings are to be calculated and compiled in tabular form. Then there mean is found. We analyze this parameter both for drinking water and sewage.
