8-Hy­droxy­quinolin-1-ium hydrogen sulfate monohydrate

In the crystal structure of the title salt hydrate, C(9)H(8)NO(+)·HSO(4) (−)·H(2)O, the quinoline N—H atoms are hydrogen bonded to the bis­ulfate anions. The bis­ulfate anions and water mol­ecules are linked together by O—H⋯O hydrogen-bonding inter­actions. The cations and anions form separate layers alternating along the c axis, which are linked by N—H⋯O and O—H⋯O hydrogen bonds into a two-dimensional network parallel to (100). Further O—H⋯O contacts connect these layers, forming a three-dimensional network, in which two R (4) (4)(12) rings and C (2) (2)(13) infinite chains can be identified.