For the oxidation of As2S3 into AsO4-3 and S by HNO3 the equivalent weight of As2S3 will be

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A s_{2} S_{3} + H^{+} + N O_{3}^{-} \to . N O + H_{2} O + A s O_{4}^{3 -} + S O_{4}^{2 -}

A s_{2} S_{3}

N O_{3}^{⊝} + A s_{2} S_{3} + H_{2} O \to A s O_{4}^{3 -} + N O + S O_{4}^{2 -} + H^{⨁}

A s_{2} S_{3}

M

A s_{2} S_{3}

A s_{2} S_{3} = M

A s_{2} S_{3} + N O_{3}^{-} + H^{+} \to A s_{2} O_{5} + N O_{2}^{-} + S O_{3} + H_{2} 0

A s_{2} S_{3}

56

H N O_{3}

A s_{2} S_{3} + H N O_{3} ⟶ H_{3} A s O_{4} + H_{2} S O_{4} + N O

28 {N O_{3}}^{-} + 3 A s_{2} S_{3} + 4 H_{2} O \to 6 {A s O_{4}}^{3 -} + 28 N O + 9 {S O_{4}}^{2 -} + 8 H^{+}

A s_{2} S_{3}

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