摘要
本文提出了计算一元弱酸HA(浓度c,离解常数K_a)溶液pH的标准化解题方法。第一类情形,比较c与K_a大小。如果c≥105K_a,则[H~+]=(cK_a+K_w)~(1/2);如果K_a≥19c,则弱酸溶液可按强酸溶液来处理,通常情况下可认为[H~+]=c。第二类情形,如果1/19K_a This paper presents a normalized method to find the pH of a solution containing a weak monoprotic acid. The normalized method has the following characteristics: Its results is very close to the true values. The calculation steps are clear and normalized. The universality of this new method is good, applicable to the pH calculation for all weak monoprotic acids except very dilute solution(6×10~(-6) mol·L~(-1)).
引文
[1]武汉大学.分析化学.第五版(上册)[M].北京:高等教育出版社,2009:119-128.
[2]华东理工大学,四川大学.分析化学.第6版[M].北京:高等教育出版社,2009:54-62.
[3]彭崇慧,冯建章,张锡瑜,等.分析化学.第3版[M].北京:北京大学出版社,2014:55-65.