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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