Na2CO3.H2O crystallizes in the orthorhombic Pca2_1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(1), and two equivalent O(2) atoms. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(4) atom. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted water-like geometry to one Na(1), one Na(2), one H(1), and one H(2) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(2), and one C(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Na(1), two equivalent Na(2), and one C(1) atom. In the fourth O site, O(3) is bonded in a 1-coordinate geometry to two equivalent Na(1) and one C(1) atom.
Na2CO3.H2O crystallizes in the orthorhombic Pca2_1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. The Na(1)-O(1) bond length is 2.59 Å. The Na(1)-O(4) bond length is 2.43 Å. There is one shorter (2.47 Å) and one longer (2.53 Å) Na(1)-O(2) bond length. There is one shorter (2.33 Å) and one longer (2.45 Å) Na(1)-O(3) bond length. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(1), and two equivalent O(2) atoms. The Na(2)-O(4) bond length is 2.39 Å. There is one shorter (2.30 Å) and one longer (2.31 Å) Na(2)-O(1) bond length. There is one shorter (2.49 Å) and one longer (2.53 Å) Na(2)-O(2) bond length. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The C(1)-O(1) bond length is 1.30 Å. The C(1)-O(2) bond length is 1.29 Å. The C(1)-O(3) bond length is 1.31 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) atom. The H(1)-O(4) bond length is 0.99 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(4) atom. The H(2)-O(4) bond length is 1.01 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted water-like geometry to one Na(1), one Na(2), one H(1), and one H(2) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(2), and one C(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Na(1), two equivalent Na(2), and one C(1) atom. In the fourth O site, O(3) is bonded in a 1-coordinate geometry to two equivalent Na(1) and one C(1) atom.