Aqueous solutions of mono, di, and triprotic acids were prepared with different molar percentages (say 10%, 20% and 30%). ammonium dihydrogen phosphate is gradually introduced in the aqueous solutions at different concentrations varied from 0.1M to 0.6M at 303K. Densities, viscosities, and velocity of sound of aqueous solutions are measured and they are used to evaluate the other parameters lik...

In the crystal structure of the title compound, C(5)H(6)N(3)O(2) (+)·H(2)PO(4) (-), the dihydrogen phosphate anions are linked through short O-H⋯O hydrogen bonds, forming infinite double chains running parallel to the b axis. Centrosymetric N-H⋯O hydrogen-bonded cationic dimers form bridges between these chains by means of inter-molecular N-H⋯O and O-H⋯O hydrogen bonds, leading to a two-dimensi...

The title compound, C(4)H(6)N(3)OS(+)·H(2)PO(4) (-), (I), was obtained as a result of hydrolysis of [(1,3-thia-zol-2-yl-amino)-carbon-yl]-phospho-ramidic acid, (II), in water. X-ray analysis has shown that the N-P bond in (II) breaks, leading to the formation of the substituted carbamide (I). This compound exists as an inter-nal salt. The unit cell consists of a urea cation and an anion of H(2)...

The cation of the title compound, C(7)H(7)N(2)S(+)·H(2)PO(4) (-), is almost planar (r.m.s deviation = 0.017 Å for all non-H atoms). In the crystal structure, the cations and anions are connected by N-H⋯O and O-H⋯O hydrogen bonds, with π-π stacking inter-actions between neighbouring 1,3-thia-zole and benzene rings [centroid-centroid distance = 3.5711 (11) Å], forming a three-dimensional network.

In the title compound, C(7)H(10)N(+)·H(2)PO(4) (-)·H(3)PO(4), there is a clear distinction between the P-O/P=O and P-OH bond lengths. In the crystal, the H(2)PO(4) (-) anions and H(3)PO(4) mol-ecules are linked by O-H⋯O hydrogen bonds, leading to layers propagating in the bc plane. The organic cations are located between these layers and inter-act with them by way of N-H⋯O hydrogen bonds.