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Fe(OH)3 ⇒Fe2O3+...

Fe(OH)3⇒Fe2(SO4)3+...

Fe2O3+...⇒Fe2(SO4)3+...

H2CO3+...⇒CО2+...

CO2+...⇒Na2CO3+...

Na2CO3+...⇒NOH+...

NOH+...⇒Na2SO4+...

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