Answer :

(i) We are given that the hydrogen ion concentration of a solution is = [H+] = 1 X 10-8 M

We know that : -


pH = - log10 [H+]


pH = - log10 [1 X 10-8 ]


pH = -[ log101 + log1010-8 ]


Now, log101 = 0


pH = -[0 + (-8) log1010 ]


Now, log1010 = 1


pH = -[0-8 ]


pH = -[-8]


pH = 8


Hence, the pH of the solution is 8.


(ii) According to relation we have : -


PH + pOH = 14


8 + pOH = 14


pOH = 14 – 8


pOH = 6


Hence, the pOH of the solution is 6.


(iii) As the pH of the solution is 8 which is greater than 7. Hence, the given solution is basic.


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