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Iv) 3. (iii) 4. (i) 5. (i) 6. (i) 7. (ii) 8. (ii) This page intentionally left blank EXPERIMENT 5 Object: Measurement of Chlorides in W ater Water THEORY Chloride is the most common ion in the water. It gives the salty taste to water particularly when sodium chloride is there. ) it is not desirable. The chloride concentration in sewage is more than the water supplied as the sodium chloride consumed by us in the food is passed through the fecal material as it is. High chloride content may harm metallic pipes and structures as well as the plants.

Actually nitrate reacts with disulphonic acid and produces a nitro- derivative that in alkaline medium produces a yellow colour.. (vii) Observe the colour developed at 410 nm with a light path of 1 cm. (viii) Calculate the concentration of nitrate from the standard curve. (ix) Prepare the standard curve using suitable aliquots of standard nitrate solution in the range of 5 to 500 mg NO3 by following the above procedure. mg/l Comments • The determination of nitrates is important from health point of view that is safe against the diseases produced • It is also used to assess the self purification capacity of water bodies and the nutrient balance in surface waters and soil.

When sewage is passed through a filter the filtrate is not clear and looks turbid (turbidity is the obstruction in the passage of light). The turbidity is because of the filterable solids. This fraction consists of colloidal solids as well as dissolved solids. The colloidal fraction consists of the particulate matter of diameter ranging from 1 milimicron to 1 micron. The colloidal fraction consists of finely divided particles of gels, emulsions, grease, oil causing foams. The colloidal particles are also the fine clay particles with same charge repulsing each other.

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