溶液体系热力学稀溶液及其性质 2017-3-30 物理化学 II 1物理化学稀溶液及其性质 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 溶液体系热力学稀溶液及其性质物理化学 II 2 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 溶液体系热力学稀溶液及其性质 3 (一)稀溶液的经验定义和分子图像亨利定律 (1803) 在一定温度和压力下,当稀溶液达气液平衡时,挥发性溶质在气相中的分压与其在溶剂中的溶解度成正比. 对稀溶液而言: B B B x m c ? ? B x B m B c B p k x k m k c ? ?? k x,, k m, k c : 亨利常数. k = f ( T, p ) 2017-3-30 物理化学 II B x B p k x ? Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 溶液体系热力学稀溶液及其性质 4 使用亨利定律时应注意: 2017-3-30 物理化学 II ⑴溶质在气相和液相中的分子形态应相同. 若溶质在液相中有少量的缔合或离解, 则必须进行某种修正. ⑵在压力不大时, 对含有多种溶质的溶液, 亨利定律分别适用于每一种溶质(但每种溶质的亨利常数是不同的). ⑶溶液越稀,亨利定律越准确。比例常数 k x通过实验测定, 以p B/x B对x B 做图,直线外延到 x B =0 ,在纵坐标上的截距即为 k x. B0 lim B xxBpkx ?? Evaluation only. Evaluation o
11-3稀溶液及其性质 来自淘豆网www.taodocs.com转载请标明出处.