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10 cards from this deck
Determine concentration of oxidising agents
Tetrathionate, S4O62−\text{S}_4\text{O}_6^{2-}S4O62−
Yellow-brown
At pale straw colour (near end point)
Deep blue-black
Colourless
1:2
1:1
White copper(I) iodide (CuI)
Complex may not break down if added too early
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