A.2.1×10-4 B.1.25×10-6 C.4.8×10-5 D.2.1×10-8
A.14_pOH B.Kθw/pOH C.10-pOH D.10-(14-pOH)
A.10Kθa% B.1000θa% C.100θa% D.100θa0.1%