4计算下列各溶液的pH:-|||-(1) .10molcdot (L)^-1HOAC 溶液-|||-(2) .10molcdot (L)^-1N(H)_(3)cdot (H)_(2)O 溶液-|||-(3) .15molcdot (L)^-1N(H)_(4)Cl 溶液-|||-(4) .15molcdot (L)^-1NaOAC 溶液-|||-(5) .1molcdot (L)^-1Na(H)_(2)P(O)_(4) 溶液-|||-(6) .05molcdot (L)^-1(K)_(2)HP(O)_(4) 溶液