Question

Last one

Which of the following statements is true of a solution at pH 7?

A. Ka and Kb are equal.
B. Kw and Kb are equal.
C. Kw, Ka and Kb are equal.
D. Kw and Ka are equal.

Answer 1

@sweetburger

Answer 2

Tbh I am not really sure about this one I am trying to think through the relation that is being asked about which is Kw=(Ka)(Kb).

Answer 3

I dont think it could be B or D.

Answer 4

Either A or C? Which one seems the best?

Answer 5

Im leaning towards A. Because in C. if Kw, Ka, and Kb were all equal then I dont think the numbers would work out correctly. Not really sure though.

Answer 6

Yeah it was A! :)

Answer 7

:)

Answer 8

I believe it's

pH = -Log[H+]
pOH = -Log[OH-]

pH + pOH = 14

pH = 7 right? So that means pOH must also be 7

So from
Kw = Ka x Kb

Ka = 10^-7
kW = 10^-14
Kb = 10^-7