KH2AsO4 crystallizes in the orthorhombic Fdd2 space group. K(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. As(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. H(1) is bonded in a linear geometry to one O(1) and one O(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1), one As(1), and one H(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one As(1), and one H(1) atom.
KH2AsO4 crystallizes in the orthorhombic Fdd2 space group. K(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. There are two shorter (2.89 Å) and two longer (3.07 Å) K(1)-O(1) bond lengths. There are two shorter (2.84 Å) and two longer (2.98 Å) K(1)-O(2) bond lengths. As(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Both As(1)-O(1) bond lengths are 1.77 Å. Both As(1)-O(2) bond lengths are 1.70 Å. H(1) is bonded in a linear geometry to one O(1) and one O(2) atom. The H(1)-O(1) bond length is 1.04 Å. The H(1)-O(2) bond length is 1.51 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1), one As(1), and one H(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one As(1), and one H(1) atom.