摘要
本文报道了一套化学反应绝热式热量计的设计和建立,用(HOCH_2)_3CNH_2与0.1mol·dm^3HCl的反应焓检验标定了热量计装置,测得ΔH_(208.15)=-245.41J·g^(-1),sdm=±0.24,与IUPAC的推荐值-245.76±0.26J·g^(-1)十分吻合,证明热量计和操作手续是可靠的。用这样的热量计测定了十一种三水合稀土氯化物RECl_3·3H_2O(RE=La,Ce,Nd,Sm,Eu,Gd,Tb,Dy,Er,Yb,Y)298.15K时在水中的积分溶解热(终浓度-0.01541mol·kg^(-1))。计算了这些水合物的标准生成焓和脱水焓。
A new type of calorimeter has been designed and Constructed. It was tested and checked with the reaction enthalpy of TRIS in 0.1 mol·dm^(-3) HCl. The △H_(TRIS) obtained is—245.41 J·g^(-1), sdm±0.24, which is in good agreement with the value recommended by IUPAC in 1976, -245.76±0.26J·g^(-1) and thus shows that our calorimeter is more reliable. It is very sensitive and accurate, that the heat change as small as 0.2 J can be determined. Integral heats of solution of RECl_3·3H_2O (RE=La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Er, Yb, Y) in water at 298.15 K and final concentration=0.01541 mol·kg^(-1) (by anhydrous salt) were determined. The standard enthalpies of formation and of dehydration (RECl_3·3H_2O→RECl_3) of some of these hydrates were calculated and discussed.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1990年第10期967-972,共6页
Acta Chimica Sinica
