大学化学 >> 2019, Vol. 34 >> Issue (4): 61-65.doi: 10.3866/PKU.DXHX201807031

化学实验 上一篇    下一篇

“分光光度法测定碘化铅溶度积常数”实验存在的问题及改进

韩福芹*(),王丽丽,宋海岩,曹晶晶,郭丽   

  • 收稿日期:2018-07-13 录用日期:2018-11-01 发布日期:2019-04-28
  • 通讯作者: 韩福芹 E-mail:hanfuqin@sina.com
  • 基金资助:
    黑龙江省高等教育教学改革项目(2017-38)

Solution to the Problem of Spectrophotometric Determination of the Solubility Product Constant of Lead Iodide

Fuqin HAN*(),Lili WANG,Haiyan SONG,Jingjing CAO,Li GUO   

  • Received:2018-07-13 Accepted:2018-11-01 Published:2019-04-28
  • Contact: Fuqin HAN E-mail:hanfuqin@sina.com
  • Supported by:
    黑龙江省高等教育教学改革项目(2017-38)

摘要:

针对"分光光度法测定碘化铅溶度积常数"实验测定方法中存在的问题,提出了改进方法。用改进后的方法测定碘化铅溶度积常数,减少了实验药品和污染,简化了实验环节和数据处理过程,使实验测定的数据更准确。并且根据热力学公式推导、计算和作图,给出了$\ln K_{\text{sp}}^{\ominus } $与1/T关系的直线方程,可以判断不同温度时测试结果的准确程度。

关键词: 溶度积常数, 实验改进, 分光光度法, 直线方程

Abstract:

Experimental procedure is improved to solve problems of spectrophotometric determination of the solubility product constant of lead iodide. With the improved method, experimental drugs and pollution are reduced, and experimental steps and data analysis are simplified, while keeping the accurate determination. With the derivation, calculation and drawing according to the thermodynamic formula, the linear equation of the relationship between $\ln K_{\text{sp}}^{\ominus } $ and 1/T is given, which can estimate the accuracy of the test results at different temperatures.

Key words: Solubility product constant, Experimental improvement, Spectrophotometry, Linear equation

MSC2000: 

  • G64