Frankly saing, spectra of sodium stearate are are exclusively uninteresting.
IR - three broad bands (CH at about 2800-3000 cm-1, and intense CO asymmetric at 1550-1620 and symmetric at 1360-1440)
proton NMR - only one CH2 and CH3 showed clearly.
For MS you should use special techniques and eventually molecular ion will be visible.
Catalogs of spectra for your compounds you can find in spectroscopy labs or in a very rich university libraries.