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

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Chemistry

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24 November, 11:04

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

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Solomon Pugh · Answer 1

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.