title: 2-Amino-benzimidazolium hydrogen sulfate.
abstract: In the title salt, C(7)H(8)N(3) (+)·HSO(4) (-), the benzimdazole ring system is planar [mean deviation 0.0086 (1) Å]. In the crystal, N-H⋯O and O-H⋯O hydrogen-bond inter-actions give rise to a layer motif.
authors.forename: Wei
authors.initials: W
authors.lastname: You
authors.forename: Ying
authors.initials: Y
authors.lastname: Fan
authors.forename: Hui-Fen
authors.initials: HF
authors.lastname: Qian
authors.forename: Cheng
authors.initials: C
authors.lastname: Yao
authors.forename: Wei
authors.initials: W
authors.lastname: Huang