Question

Excess of na2s2o3 solution reacts with aqueous cuso4 to give

Answer 1

Naso4+ cu2s2o3

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Answer 2

Excess sodium thiosulphate reacts with copper sulphate to form a complex compound Sodium cuprothiosulphate.

• Sodium thiosulphate is a reducing agent.
• It reduces copper sulphate to cupric thiosulphate in the first step.
• One more mole of sodium thiosulphate reduces cupric thiosulphate to yield a cuprous compound which on further reduction forms a complex, Sodium cuprothiosulphate.
• The reactions are depicted below:

                 $Na_{2}S_{2} O_{3} + CuSO_{4}$ →  $CuS_{2}O_{3} + Na_{2} SO_{4}$

                 $2CuS_{2}O_{3} + Na_{2} S_{2} O_{3}$ → $Cu_{2} S_{2}O_{3} + Na_{2} S_{4} O_{6}$

                 $3Cu_{2} S_{2}O_{3} +2 Na_{2} S_{2} O_{3}$ → $Na_{4} [Cu_{6} (S_{2} O_{3})_{5} ]$