KVV E-Modules - Estimation of chloride in given water samples

Quadrant -I (Video)

Estimation of chloride in given water samples

Quadrant - II (Study Material)

1. Estimation of chloride in given water samples

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Quadrant - III (Assignments)

1. Estimation of chloride in given water samples

Estimation of chloride in water samples is commonly done by the argentometric titration method, specifically Mohr's method. This involves titrating the water sample containing chloride ions with a standard silver nitrate (AgNO₃) solution. Potassium chromate (K₂CrO₄) is used as an indicator, which turns reddish-brown at the endpoint when all chloride ions have reacted, indicating the formation of red silver chromate precipitate. The chloride concentration is then calculated from the volume of silver nitrate used. This method is widely used to assess water quality by measuring chloride content, which is important for detecting contamination and preventing corrosion in water systems.

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Quadrant - IV (MCQs)

1. -------------------- is the primary principle behind the estimation of chloride in water samples.

A: Silver nitrate reacts with bicarbonates to form a precipitate. B: Chlorides form a blue precipitate with silver nitrate. C: Chlorides dissolve in water and do not react with any reagent. D: Chlorides react with silver nitrate to form a white precipitate of AgCl.

2. ------------is the appearance of the end point during the titration of chloride with silver nitrate?

A: Blue precipitate B: Colorless solution C: Green precipitate D: Yellow to brick red color

--------------------chemical is used as an indicator in the estimation of chloride.

A: Potassium chromate B: Potassium iodide C: Potassium dichromate D: Potassium bromate

-----------------------the purpose of adding potassium chromate solution to the sample during the titration.

A: To form a yellow color that indicates the presence of chlorides B: To detect the presence of nitrates in the sample C: To react with silver nitrate D: To prevent silver nitrate from reacting with chlorides

How is silver nitrate prepared for the titration of chloride in water samples?

A: Dissolve 3.4 g of AgNO3 in 100 ml of distilled water. B: Dissolve 3.4 g of AgNO3 in 1 liter of distilled water. C: Dissolve 0.02 g of AgNO3 in 1 liter of water. D: Dissolve 5 g of AgNO3 in 100 ml of distilled water.

------------------- the recommended chloride limit in drinking water according to the introduction?

A: 50 mg/L B: 1000 mg/L C: 100 mg/L D: 200 mg/L

----------------------color does the solution turn when all the chloride ions are precipitated during the titration.

A: Brick red B: Blue C: yellow D: Green

------------------------is NOT an apparatus used in the chloride estimation procedure.

A: Spectrophotometer B: Burette C: Conical flask D: Beaker

What should you do if the chloride concentration in the water sample is too high for titration?

A: Add more silver nitrate B: Dilute the sample C: Discard the sample D: Use a different reagent

--------------------- readings should be taken during the titration to ensure accuracy?

A: Two readings B: Four readings C: Three readings D: One reading

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