8.计算下列溶液的pH:-|||-(1) .10molcdot (L)^-1HAC 溶液 _(a)=1.752times (10)^-5;-|||-(2) .10molcdot (L)^-1CLC(H)_(2)COOH (氯乙酸);( _(a)=1.4times (10)^-3)-|||-(3).求 https:/img.cdnjtzy.com/zyb_5cfcbf927c29e6c321cef0336590a89f.jpg.0times (10)^-4molcdot (L)^cdot 1HCN 溶液的pH。( _(a)=6.2times (10)^10-|||-(4).计算 .1molcdot (L)^-1(Na)_(2)C(O)_(3) 溶液的pH。(已知 _({a)_(1)}=4.2times (10)^-7 ; _({a)_(2)}=5.6times (10)^-11-|||-(5).计算 .10molcdot (L)^-1NaHC(O)_(3) 溶液的pH。(已知 (K)_(a)=6.34 ; ({K)_(2)}^2=10.25-|||-(6).计算 .10molcdot (L)^-1N(H)_(4)CN 溶液的pH。