Chlorine is, indeed, a micronutrient required for plant growth, but necessary only in minute quantities. Because chlorine can kill bacteria, in excessive amounts it could have a negative impact on the good soil bacteria that benefit plants. Excessive chlorine can also directly injure plant roots.

Chlorine Deficiency On other plant species, the most commonly described symptom of Cl deficiency is wilting of leaves, especially at the margins. As the deficiency progresses and becomes more severe, the leaves exhibit curling, bronzing, chlorosis, and necrosis.

Its functions in plant growth and development include osmotic and stomatal regulation, evolution of oxygen in photosynthesis, and disease resistance and tolerance. At adequate levels of supply, Cl improves the yields and quality of many crops such as onions and cotton if the soils are deficient in this nutrient.

Too much chloride on garden plants, such as those grown by the poolside, will result in the same symptoms as salt damage: leaf margins may be scorched, leaves will be smaller and thicker, and overall plant growth may be reduced.

Excess chlorides should be leached below the active root zone. Water containing chloride concentration of less than 150 mg/l of chloride are safe for most crops, provided that proper irrigation management practices are applied.

Too much chlorinated water all at once can even kill trees. It doesn’t take much chlorine for damage to occur. Some experts say the concentration threshold for tree damage can be as low as 0.5 parts per million.

Chloride ions in soil can be determined by silver nitrate titration using potassium chromate as an indicator.

To determine the amount of chloride (in the form of Cl–) present in the given water sample by Mohr’s method. If water containing chlorides is titrated with silver nitrate solution, chlorides are precipitated as white silver chloride. Potassium chromate is used as indicator, which supplies chromate ions.

The average concentration of Cl− in the earth crust, lithosphere and soil is 1.50 g kg−1, 0.48 g kg−1 (Yaalon, 1963) and 0.10 g kg-1 (Bohn et al., 2001), respectively.

Potassium chromate can serve as an end point indicator for the argentometric determination of chloride, bromide and cyanide ions by reacting with silver ions to form a brick-red silver chromate precipitate in the equivalence point region.

silver nitrate solution

The measured chloride ions can be used to know salinity of different water sources. For brackish water (or sea water or industrial brine solution), it is an important parameter and indicates the extent of desalting of apparatus required.

In the Fajans method, named after Kazimierz Fajans, typically dichlorofluorescein is used as an indicator; the end-point is marked by the green suspension turning pink. Prior to the end-point of the titration, chloride ions remain in excess. They adsorb on the AgCl surface, imparting a negative charge to the particles.

A) (ii) Disadvantages of Mohr Method  Mohr’s method is suitable only for titration of chloride, bromide and cyanide alone.  Errors can be introduced due to the need of excess titrant before the endpoint colour is visible.  Before to the end-point of the titration, chloride ions remain in excess.

Postulates of Fajans’ Rule EXAMPLE :- By Fajans’ Rules, compounds are more likely to be ionic if: there is a small positive charge on the cation, the cation is large, and the anion is small. For example, NaCl is correctly predicted to be ionic since Na+ is a larger ion with a low charge and Cl− is a smaller anion.

Fajan’s method :- The indicator which is a dye existing in solution as the ionized from usually anion . This method is generally used for the quantitative analysis of halide ions or thiocyanate ions. Take 10 ml sample of NaCl. Titrate the above mixture solution by using standard 0.1 N AgNO3 solution.

This method determines the chloride ion concentration of a solution by titration with silver nitrate. As the silver nitrate solution is slowly added, a precipitate of silver chloride forms. If the solutions are acidic, the gravimetric method or Volhard’s method should be used.

The volhard method is an indirect or back titration method in which an excess of a standard solution of silver nitrate is added to a chloride containing sample solution. The excess silver is then back titrated using a standardized solution of potassium or ammonium thiocyanate with ferric ion as an indicator.

: a method for the determination of chlorine, bromine, and iodine in the form of halides by precipitating them with excess silver nitrate and titrating the excess with a thiocyanate solution.

In this type of titration the strength of a solution is determined by its complete precipitation with a standard solution of another substance.

Argentometric titration uses a silver(I) ion titrant (typically silver nitrate) to determine the concentration of primarily chloride ions in solution….

The titrations with silver nitrate are known as argentometric titration. This titration is carried out for chloride, cyanide, and bromide ions. Sodium chromate acts as an indicator. Stay tuned with BYJU’S to learn more about other concepts such as the types of titration.

An indicator that could be used is potassium chromate(VI). Silver ions can combine with chromate(VI) ions to produce a red precipitate of silver chromate(VI). So the sudden appearance of the red silver chromate can be used to indicate the end point of the titration.