a)
pH = 2
=> [H+] = 10-2 M
=> \(\left[OH^-\right]=\dfrac{10^{-14}}{10^{-2}}=10^{-12}M\)
b)
pH = 10
=> \(\left[H^+\right]=10^{-10}M\)
=> \(\left[OH^-\right]=\dfrac{10^{-14}}{10^{-10}}=10^{-4}M\)
c) pH = 6
=> \(\left[H^+\right]=10^{-6}M\)
=> \(\left[OH^-\right]=\dfrac{10^{-14}}{10^{-6}}=10^{-8}M\)
d)
pH = 8
=> \(\left[H^+\right]=10^{-8}M\)
=> \(\left[OH^-\right]=\dfrac{10^{-14}}{10^{-8}}=10^{-6}M\)