题目
13.下列多元酸,用NaOH标准溶液滴定时出现两个明显滴定突跃的是: C-|||-A. _(2)S((K)_(a1)^theta =9.1times (10)^-8 , _(a2)^theta =1.2times (10)^-15) ;-|||-B. _(2)(C)_(2)(O)_(4)((K)_(a1)^theta =5.9times (10)^-2 , _(2)theta =6.4times (10)^-5) ;-|||-C. _(3)P(O)_(4)((K)_(a1)^theta =7.5times (10)^-3 , _(a2)^theta =6.2times (10)^-8 , _(a3)^theta =2.2times (10)^-13 ;-|||-D. _(6)(H)_(4)((COOH))_(2)(({K)_(a)^theta )}=1.3times (10)^-3 , _(2)theta =2.9times (10)^-6)
题目解答
答案
C. ${H}_{3}P{O}_{4}({K}_{a1}^{\theta }=7.5\times {10}^{-3}$ , ${K}_{a2}^{\theta }=6.2\times {10}^{-8}$ , ${K}_{a3}^{\theta }=2.2\times {10}^{-13}$ ;