Аннотация:Heats of diln. were detd. at 298.15K for solns. contg. Ca 0.01-0.03 and 18-crown-6 0.01-0.05 M. The 43Ca NMR spectra were measured at 291 K. Thermodn. equil. consts. for 1:1 complex formation (log K) are Ca(NO3)2 1.1 В± 0.16 and CaCl2 0.67 В± 0.14. The results obtained by the 2 different methods agree within exptl. error.