What is the purpose of adding Na2CO3 in the preparation of Na2S2O3•5H2O solution? Why the Na2S2O3•5H2O solution must be stored in the dark?

Chemistry & Chemical Reactivity
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ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter22: The Chemistry Of The Transistion Elements
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  1. What is the purpose of adding Na2CO3 in the preparation of Na2S2O3•5H2O solution?
  2. Why the Na2S2O3•5H2O solution must be stored in the dark? 
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