4. What volume of the organic phase (extractant containing caprylic acid) must be taken in order to extract 99.9% of cobalt from 1 m3 of its aqueous ammonia solution containing 1 g/l Co2+? What will be its concentration in the organic phase? DCo under these conditions is 4000.
Answer: C (Co2+) o.f. = 3.99 g/l; V(o) = 0.25 m3.
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