Homework Answers
8)
A- dissociates as:
A- +H2O -----> HA + OH-
6.27*10^-2 0 0
6.27*10^-2-x x x
Kb = [HA][OH-]/[A-]
Kb = x*x/(c-x)
Assuming x can be ignored as compared to c
So, above expression becomes
Kb = x*x/(c)
so, x = sqrt (Kb*c)
x = sqrt ((4.9*10^-10)*6.27*10^-2) = 5.543*10^-6
since c is much greater than x, our assumption is correct
so, x = 5.543*10^-6 M
So, [OH-] = x = 5.543*10^-6 M
use:
pOH = -log [OH-]
= -log (5.543*10^-6)
= 5.25
use:
PH = 14 - pOH
= 14 - 5.25
= 8.75
Answer: 8.75
Only 1 question at a time please
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could someone please answer and explain the questions please!!
#’s 7,8,9,13,14,17,18,19,20
please and thank you
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if you can't answer all ,please don't answer
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