The assignment of singlet at 1.55 ppm and the 1:1:1 triplet at 1.519 ppm to H(2)O and HOD in the 400 MHz (1)H NMR spectrum of CDCl(3) solvent were supported by complete basis set (CBS) GIAO-B3LYP calculated chemical shift and the CBS B3LYP estimated (2)J(D,H) spin-spin coupling constant (SSCC). The CBS fitting of B3LYP/cc-pCVxZ and B3LYP/pcJ-n predicted SSCC values, the accurate value of (2)J(D,H) = -1.082 +/- 0.030 Hz of HOD in chloroform-d(1) and the H/D isotopic shift of 0.0307(1) ppm were reported for the first time. The agreement between CBS B3LYP predicted chemical shift, spin-spin values and experiment was good.