Enthalpy of dissolution and thermal dehydration of calcium oxalate hydrates

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F15%3A39899527" target="_blank" >RIV/00216275:25310/15:39899527 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s10973-014-4350-x" target="_blank" >http://dx.doi.org/10.1007/s10973-014-4350-x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10973-014-4350-x" target="_blank" >10.1007/s10973-014-4350-x</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Enthalpy of dissolution and thermal dehydration of calcium oxalate hydrates

Popis výsledku v původním jazyce

The enthalpies of dissolution of calcium oxalate hydrates at 25 A degrees C were calculated from indirect calorimetric experiments requiring three easy measurable reactions. The first reaction was dissolution of calcium oxalate hydrates in hydrochloric acid, dissolution of sodium oxalate in hydrochloric acid was used as the second, and dissolution of sodium oxalate in tetramethylammonium chloride as the last one. The results Delta(diss) H = 21.1, 20.8 and 31.7 kJ mol(-1) correspond to mono-, di- and trihydrate form. Dehydration enthalpy of these hydrates was determined by DSC method in the temperature range of 20-300 A degrees C. Corresponding values of Delta(deh) H for dehydration of 1, 2 and 3 mol of water from calcium oxalates are 66.5, 83.6 and 143.9 kJ mol(-1). The estimation of enthalpy of formation from DSC experiments gives values -1,984 and -2,296 kJ mol(-1) for calcium oxalate dihydrate and trihydrate, respectively. The enthalpy contribution of the water in the calcium oxalat

Název v anglickém jazyce

Enthalpy of dissolution and thermal dehydration of calcium oxalate hydrates

Popis výsledku anglicky

The enthalpies of dissolution of calcium oxalate hydrates at 25 A degrees C were calculated from indirect calorimetric experiments requiring three easy measurable reactions. The first reaction was dissolution of calcium oxalate hydrates in hydrochloric acid, dissolution of sodium oxalate in hydrochloric acid was used as the second, and dissolution of sodium oxalate in tetramethylammonium chloride as the last one. The results Delta(diss) H = 21.1, 20.8 and 31.7 kJ mol(-1) correspond to mono-, di- and trihydrate form. Dehydration enthalpy of these hydrates was determined by DSC method in the temperature range of 20-300 A degrees C. Corresponding values of Delta(deh) H for dehydration of 1, 2 and 3 mol of water from calcium oxalates are 66.5, 83.6 and 143.9 kJ mol(-1). The estimation of enthalpy of formation from DSC experiments gives values -1,984 and -2,296 kJ mol(-1) for calcium oxalate dihydrate and trihydrate, respectively. The enthalpy contribution of the water in the calcium oxalat

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CA - Anorganická chemie

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Thermal Analysis and Calorimetry

ISSN

1388-6150

e-ISSN

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Svazek periodika

119

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

6

Strana od-do

2063-2068

Kód UT WoS článku

000350225500056

EID výsledku v databázi Scopus

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