What is the role of Roschelle salt in fehling's solution ?
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In alkaline medium , Cu²⁺ ions get precipitated as Cu(OH)₂. To keep Cu²⁺ ions in solution in alkaline medium Roschelle salt is added . This combines with insoluble Cu(OH)₂ to form a soluble complex between Cu²⁺ and tartrate ion and therefore goes into the solution .
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