一元弱酸HA和HB混合溶液的pH计算

doi:10.3866/PKU.DXHX202008011

University Chemistry ›› 2021, Vol. 36 ›› Issue (6): 2008011.doi: 10.3866/PKU.DXHX202008011

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The pH Calculation of the Mixed Weak Acids of HA and HB Solutions

Dawei He, Haishui Wang()

School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

Received:2020-08-04 Accepted:2020-09-01 Published:2020-10-09
Contact: Haishui Wang E-mail:wanghsh@scut.edu.cn

Abstract

Abstract:

A novel approximate formula [H⁺]_p is proposed to obtain the pH of the mixed HA and HB solutions, where[H⁺]_HA and[H⁺]_HB are the estimated values of[H⁺] for HA solution and HB solution, respectively. If c_HA ≥ 2K_HAand c_HB ≥ 2K_HB, [H⁺]_p formula will work very well. The novel approximation formula is simple, easy to remember, and can be widely used to calculate the pH of the mixed monoprotic weak acid HA and HB solutions.

Key words: Monoprotic weak acid, Mixed solution, pH, Approximation formula

Dawei He, Haishui Wang. The pH Calculation of the Mixed Weak Acids of HA and HB Solutions[J].University Chemistry, 2021, 36(6): 2008011.

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The pH Calculation of the Mixed Weak Acids of HA and HB Solutions

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