why do we use 0.025N sodium thiosulphate for the titrate
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hydroxide forming a mixture of higher, oxides (brown colour compound), which on acidification in the presence of an iodide, release iodine in a quantity chemically equivalent to the oxygen content of the water sample. The liberated iodine is then titrated with a standard solution of sodium thiosulphate.
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Hello
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Solubility of oxygen in water depends on temperature and salt content of water. The solubility is maximum at 0?C (14.7 mg/l) and minimum at 100? (0 mg/l). Rate of oxygen dissolution depends on water turbulence and dissolved oxygen present in water. There is a balance between dissolved oxygen concentration and oxygen in air. As there is possibility of change in DO during transfer and storage of sample it is essential to fix DO at site of sampling. There are two methods for DO analysis i.e. iodometric and electrometric.
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