No abstract

The heat capacity of potassium acetate was measured by equilibrium adiabatic calorimetry from near 4 K up to 350 K and by d.s.c. from 325 K through melting (solid to isotropic liquid) to 585 K. No transition or anomaly was observed below 300 K in the heat-capacity curve but four anomalies were observed at super-ambient temperatures including a broad and diffuse hump extending from 300 to 375 K. A bifurcated peak was observed between 375 and 436.5 K with peak temperatures at 411 and 425 K and with enthalpy increments (A,,,Ha of 41.7 and 22.8R. K and entropy increments (A&J of 0.097R and O.O5R, respectively. A peak believed to be of first order (solid-to-solid transformation) was observed at 474 K having A,HL and A,,.sP, of 194R. K and 0.407R. Finally, a solid-to-(isotropic) liquid transition occurred at 582 K having

Concerning n-pentanoate, the discontinuous (predominantly first-order) crystal-to-crystal transition at 209.31 K is followed almost immediately by a broad and diffused "hump" (with a maximum at 319.06 K), which stretches over a temperature range of about 110 K, and is apparently related to the occurrence of a gradual higher-order, possibly second-order) transformation. Concerning n-heptanoate, the nature and order of its single transition should be the same as suggested for the lowertemperature transformation of the shorter homolog. At the transition temperatures, the values of C&R, A

The heat capacities of solid lithium n-butanoate and n-hexanoate have been investigated by adiabatic calorimetry between 5 and 350 K. The values at T = 298.

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