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What is the function of Rochelle salt in...

What is the function of Rochelle salt in Fehling's solution ?

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In alkaline medium `Cu^(2+)` ions get precipitate as `Cu(OH)_(2)`. To keep `Cu^(2+)` ions in solution in alkaline medium, Rochelle salt is added. The insoluble `Cu(OH)_(2)` first formed goes into solution due to the formation of a soluble complex between `Cu^(2+)` ions and tartrate ion as shown below:
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Knowledge Check

  • Rochelle salt is

    A
    ammonium tartarate
    B
    sodium ammonium tartarate
    C
    potassium ammonium tartarate
    D
    sodium tartarate

  • Fehlings solution is

    A
    `AgNO_(3)` solution `+ NaOH` solution `+ NH_(4)OH`
    B
    Alkaline solution of Cupric ion complexed with citrate ion
    C
    Copper sulphate `+` sodium potassium tartarate `+ NaOH`
    D
    Copper sulphate solution

  • Fehlings solution is

    A
    `AgNO_(3)` solution `+ NaOH` solution `+ NH_(4)OH`
    B
    Alkaline solution of Cupric ion complexed with citrate ion
    C
    Copper sulphate `+` sodium potassium tartarate `+ NaOH`
    D
    Copper sulphate solution