問題詳情
10. Consider the titration of 50.0 mL of 0.100 M NaH2PO4(aq) with 0.100 MNaOH(aq). For H3 PO4,
= 7.5 x
.Three pH values during the titration are listed as follows.
(1) Before the addition of NaOH(aq), the pH is x.
(2) After the addition of 25.0 mL NaOH(aq), the pH is y.
(3) After the addition of 50.0 mL NaOH(aq), the pH is z.
Which of the following statements about x, y, and z is correct?(log2 = 0.301,10g3 = 0.477,log5=0.699)
(A)x＜4,y＞7
(B)x>4，z>10
(C)y＞7,z＜10
(D)y＞8,z＞9
參考答案
答案：C
難度：計算中-1
書單：沒有書單，新增