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The crystal structure of the title compound, C2H10N2O2+&BULL; 2Cl(-), is built up from one 2-hydroxyethylhydrazinium(2+) cation and two Cl- anions. The molecular structure is stabilized by O-H&BULL;&BULL;&BULL; Cl and N-H&BULL;&BULL;&BULL; Cl hydrogen bonds. The crystal structure is stabilized by one N-H&BULL;&BULL;&BULL; O and three N-H&BULL;&BULL;&BULL; Cl interactions, and the three-dimensional network of hydrogen bonds stabilizes the crystal packing. All five hydrazinium H atoms are involved in hydrogen bonds to Cl- anions. The Cl&BULL;&BULL;&BULL; H contact distances range from 2.122 (15) to 2.809 (14) &ANGS;.