“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

doi:10.3866/PKU.DXHX201807031

Abstract

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

Fuqin HAN,Lili WANG,Haiyan SONG,Jingjing CAO,Li GUO. Solution to the Problem of Spectrophotometric Determination of the Solubility Product Constant of Lead Iodide[J].University Chemistry, 2019, 34(4): 61-65.

10⁴c(I^-)/(mol·L^-1)	A
5.83	0.150
8.08	0.210
10.0	0.256
11.7	0.303
13.1	0.343

试管编号	A	10⁴c(I^-)/(mol·L^-1)	10³b/(mol·L^-1)	10³d/(mol·L^-1)	${{10}^{9}}K_{\text{sp}}^{\ominus }\left( \text{Pb}{{\text{I}}_{\text{ 2}}} \right) $
1	0.217	8.3	2.49	1.24	7.7
2	0.217	8.3	2.49	1.24	7.7
3	0.215	8.3	2.49	1.24	7.7

T/K	10³T^-1/K^-1	${{10}^{9}}K_{\text{sp}}^{\ominus } $	$\ln K_{\text{sp}}^{\ominus } $
278	3.60	2.6	-19.77
283	3.53	3.9	-19.36
288	3.47	5.4	-19.04
293	3.41	7.5	-18.71
298	3.36	9.8	-18.44

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

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