(1)hybridization and molecular geometry (2)pk and pH (3)the position of equilibrium in an acid-base reaction 2.教学难点 (1)hybridization and molecular geometry (2)acid strength 四、教学方法选择(1) hybridization and molecular geometry (2) pka and pH (3) the position of equilibrium in an acid–base reaction 2.教学难点 (1) hybridization and molecular geometry (2) acid strength 四、教学方法选择