Question

1. Hydrogen bromide(HBr) is a strong, highly corrosive acid and what is the pOH of a 0.0375M HBr solution?
a)12.57
b)12.27
c)1.73
d)1.43
I can't fogure out what the answer should be as I don't know whether 0.0375M is the [H^+] or [OH^-]
If 0.0375M is the [OH^-], then I know the answer is 1.43(d). But if 0.0375M is [H^+] ,it would be12.57(a), right?

2. Which of the following is NOT a characteristic of a base?
a)bitter taste
b)ability to conduct electricity
c) reactivity with some metals
d)slippery feel
I guess it is b,is it right?

Thanks in advance.

Answer 1

yes you are correct for both questions

if it is not stated that it is [H+] or [OH-] then you should ask your teacher

Answer 2

In the case of HBr, you know the ionization is
HBr ==> H^+ + Br^-
So the 0.0375 is the (H^+) which makes the pH = 1.43 and the pOH = 12.57.

For the second question, I think the answer is "None of the above."
a,c, and d DEFINITELY are true. b is true, also, if we are talking about a solution. The solid base won't conduct electricity. Perhaps b is the best choice but I think it's a poor question (actually poor answers).

Answer 3

lasfh;ja

Answer 4

pOH is -log[OH-] so the answer would be 1.43