[cataban11]

I have two questions I am unsure of

For which of the following 0.10 M diprotic acids would the second dissociation affect the pH significantly?
Question 3 options:
H2C; Ka1 = 1.3 × 10–4, Ka2 = 5.2 × 10–9T
he second dissociation never affects the pH significantly.
H2A; Ka1 = 4.2 × 10–2, Ka2 = 1.8 × 10–7
H2B; Ka1 = 2.4 × 10–4, Ka2 = 6.1 × 10–8
H2D; Ka1 = 1.8 × 10–3, Ka2 = 9.3 × 10–4
(I put B, but D is pretty close to original Ka)

Which of the following solutions is incorrectly described?Question 1 options:
0.20 M ClOH would be basic
0.15 M HN3 would be acidic
0.25 M NH4Cl would be acidic
0.15 M KBr would be neutral
0.25 M NaH would be basic
(I think it is C. NH4Cl or B. HN3)

[chenbeier]

2. Question, what is ClOH in your opinion?

[Babcock_Hall]

cataban11,
Can you give us your reasoning?