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15 cards from this deck
Reducing agent
Na2S2O3⋅5H2O\text{Na}_2\text{S}_2\text{O}_3 \cdot 5\text{H}_2\text{O}Na2S2O3⋅5H2O
Five water molecules
S2O32−\text{S}_2\text{O}_3^{2-}S2O32−
S4O62−\text{S}_4\text{O}_6^{2-}S4O62−
Oxidising agent
1:2
Efflorescent - loses water, making accurate weighing impossible
When solution becomes pale yellow
Blue-black
Blue-black colour disappears
Sulfur has replaced oxygen
I2+I−→I3−\text{I}_2 + \text{I}^- \rightarrow \text{I}_3^-I2+I−→I3−
To prevent decomposition
Tetrathionate ion (S4O62−\text{S}_4\text{O}_6^{2-}S4O62−)
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