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(i) The preparation of sodium carbonate extract affords a convenient method for bringing the anions of the mixture into solution which were otherwise insoluble with caution of salt.

(ii) It removes the basic radical (usually coloured) which interferes in the usual tests of some of the acidic radicals.

(iii) The residue can be used for the tests of basic radicals of I to VI groups. Such a solution does not involve the problem of removing interfering radicals like oxalate, fluoride, borate and phosphate.

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Q: Why is sodium carbonate extract prepared in semi micro analysis?
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