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Na
2
S
2
O
3
H
2
S
O
4
→
Na
2
S
O
4
S
S
O
2
H
2
O
Reactants:
Na
2
S
2
O
3
H
2
S
O
4
Products:
Na
2
S
O
4
S
S
O
2
H
2
O