【简答题】They letting him go and would like him to stay on after his present contract expires.
【单选题】They letting him go and would like him to stay on after his present contract expires.
【简答题】Fill in the blanks with the expressions learned in this module. Change the form where necessary. 1. The Chinese swimmer was at the beginning of the women ’ s 100-meter freestyle final, but she didn ’ ...
【单选题】欲配制 pH=3 的缓冲溶液 , 从缓冲容量考虑 , 应选用的最佳弱酸是 ( )及其共轭碱。 草酸 (pK θ a1 =1.27) 邻苯二甲酸 (pK θ a1 =2.95) 酒石酸 (pK θ a =4.37) 磷酸 (pK θ a1 =2.12)
【单选题】欲配制 pH=3 的缓冲溶液 , 从缓冲容量考虑 , 应选用的最佳弱酸是 ( ) 草酸 (pK θ a1 =1.27) 邻苯二甲酸 (pK θ a1 =2.95) 酒石酸 (pK θ a =4.37) 磷酸 (pK θ a1 =2.12)
【简答题】磷酸的 pK a1 =2.12 , pK a2 =7.21 , pK a3 =12.66 。溶液中 H 2 PO 4 - 分布分数最大时,pH= ,溶液中 HPO42- 分布分数最大时, pH= 。
【单选题】磷酸 pK a 1、 pK a 2、 pK a 3 分别为2.12、7.20、12.36,在pH=1.0的磷酸溶液中,磷酸的主要存在形体为( )
【简答题】They had no plan of letting him go.
【简答题】磷酸的 pK a1 =2.12 , pK a2 =7.21 , pK a3 =12.66 。溶液中 H 2 PO 4 - 分布分数最大时 ,溶液中 H 2 PO 4 - 分布分数最大时 。