基于分布分数图对一元弱酸相关的滴定曲线的讨论

doi:10.3866/PKU.DXHX202108032

University Chemistry ›› 2021, Vol. 36 ›› Issue (9): 2108032.doi: 10.3866/PKU.DXHX202108032

Special Issue: 分析化学课程与实验教学

• Self Studies • Previous Articles

Discussion on the Titration Curve Concerning Monoprotic Acid Using the Distribution Diagram

Na Li()

College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Received:2021-08-13 Accepted:2021-08-18 Published:2021-08-24
Contact: Na Li E-mail:lina@pku.edu.cn

Abstract

MSC2000:

Na Li. Discussion on the Titration Curve Concerning Monoprotic Acid Using the Distribution Diagram[J].University Chemistry, 2021, 36(9): 2108032.

K_a	1 × 10^?2	1 × 10^?3	1 × 10^?4	5 × 10^?5	1 × 10^?5	5 × 10^?6	1 × 10^?6	5 × 10^?7	1 × 10^?7
x(HA)	10^?7.00	10^?6.00	10^?5.00	10^?4.70	10^?4.00	10^?3.70	10^?3.00	10^?2.70	10^?2.00
E	0.02%	0.02%	0.02%	0.02%	0.01%	?4 × 10^-⁵%	?0.08%	?0.2%	?1%

pH_ep	K_a	1 × 10^-²	1 × 10^-³	1 × 10^-⁴	5×10^-⁵	1 × 10^-⁵	5×10^-⁶	1 × 10^-⁶	5×10^-⁷	1 × 10^-⁷
4.4	x(A^-)	0.996	0.962	0.715	0.557	0.201	0.112	0.025	0.0124	0.0025
	HCl误差	99.5%	96%	71.4%	55.6%	20.0%	11.1%	2.4%	1.2%	0.2%
9.0	x(HA)	10^-^7.00	10^-^6.00	10^-^5.00	10^-^4.70	10^-^4.00	10^-^3.70	10^-^3.00	10^-^2.70	10^-^2.00
	总量误差	0.01%	0.01%	0.01%	0.01%	0.005%	0.0002%	^-0.04%	-0.09%	^-0.5%

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Discussion on the Titration Curve Concerning Monoprotic Acid Using the Distribution Diagram

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