What is the $pH$ of a $0.001 \, M \, KOH$ solution at $90 \, ^\circ C$ $(K_w = 10^{-12})$?

The $pH$ of a $0.02 \, M$ solution of hydrochloric acid is

Calculate the $pH$ of $1.0 \times 10^{-8} \ M \ NaOH$ solution.

Concentration of $H^{+}$ ions in $10^{-4} \ M \ HCl$ solution is

Calculate the $pH$ of $0.01 \ M$ sulphuric acid.

Assuming complete dissociation,calculate the $pH$ of the following solutions:
$(i) \ 0.003 \ M \ HCl$
$(ii) \ 0.005 \ M \ NaOH$
$(iii) \ 0.002 \ M \ HBr$
$(iv) \ 0.002 \ M \ KOH$