What is the ph of a solution of 1.0 × 10-9 m naoh (include 1 digit after the decimal in your answer)?

Answer is: pH of NaOH solution is 5.
Reaction: NaOH → Na⁺ + OH⁻.
c(NaOH) = 1,0·10⁻⁹ mol/dm³.
pH = ?
from reaction: c(OH⁻) = c(NaOH).
c(OH⁻) = 1,0·10⁻²³ mol/dm³.
pOH = -log(c(OH⁻)) = 9.
pH + pOH = 14.
pH = 14 - pOH.
pH = 14 - 9 = 5.
pH is potential of hydrogen.

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