[H^+] = 0.08M
[OH^-] = Kw/[H^+]
= 1*10^-14/0.08
= 1.25*10^-13M
PH = -log[H^+]
= -log0.08
= 1.097
POH = 14-PH
= 14-1.097
= 12.903
b. [OH^-] = 1.9*10^-9M
[H^+] = Kw/[OH^-]
= 1*10^-14/(1.9*10^-9)
= 5.26*10^-6M
PH = -log[H^+]
= -log(5.26*10^-6)
= 5.28
POH = 14-PH
= 14-5.28
= 8.72
c. PH = 7.41
-log[H^+] = 7.41
[H^+] = 10^-7.41 = 3.9*10^-8M
[OH^-] = Kw/[H^+]
= 1*10^-14/(3.9*10^-8)
= 2.56*10^-7M
POH = 14-PH
= 14-7.41
= 6.59
d. POH = 5.45
-log[OH^-] = 5.45
[OH^-] = 3.55*10^-6M
[H^+] = Kw/[OH^-]
= 1*10^-14/(3.55*10^-6)
= 2.8*10^-9M
PH = 14-POH
= 14-5.45
= 8.55
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