The following proton-transfer reaction is incomplete: Which species belongs in the…

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

The following proton-transfer reaction is incomplete: HS−+X⇌H2S+OH−HS^- + \boxed{\phantom{\text{X}}} \rightleftharpoons H_2S + OH^- Which species belongs in the box to balance the reaction? (a) H3O+H_3O^+ (b) H2OH_2O (c) S2−S^{2-} (d) H+H^+

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