nh3.h2o+hcl=nh4cl+h2o.反应后为0.01摩尔氯化铵和0.03摩尔氨水，溶解在0.5升溶液中。[nh4+]=0.02摩尔/升，[nh3.h2o]0.06摩尔/升。kb=[oh-]*[nh4+]/[nh3.h2o]=[oh-]*0.01/0.03=10^-4.75，[oh-]=3*10^-4.75=4.27，ph=pk(nh4cl）+lg（0.02/0.06）=9.73
