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Updated: May 12, 2025
Nearly pure samples of this mineral are easily obtainable and should be used for practice, since many impurities, notably iron, seriously interfere with the accurate determination of the antimony by iodometric methods. It is, moreover, essential that the directions with respect to amounts of reagents employed and concentration of solutions should be followed closely.
The liberated iodine is then determined by titration with sodium thiosulphate, as described on page 78. The titration of iodine against sodium thiosulphate, with starch as an indicator, may perhaps be regarded as the most accurate of volumetric processes. The fundamental reaction upon which iodometric processes are based is the following: I + 2 Na S O > 2 NaI + Na S O .
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