3.取某一元弱酸(HA)纯品1.250g,制成50ml水溶液。用NaOH溶液( .0900molLL )滴定-|||-至化学计量点,消耗41.20ml。在滴定过程中,当滴定剂加到8.24ml时,溶液的pH为4.30。计-|||-算①HA的摩尔质量;②HA的K8值;③化学计量点的pH。-|||-(①337.1;② https:/img.cdnjtzy.com/zyb_d642a18905837f3a8a61d461189373aa.jpg.26times (10)^-5 ;③8.76)