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Subjects
Science State Board
Class 10
Types of chemical reactions
Textbook questions

21. Intext Example II

Exercise condition:

5 m.

The hydroxyl ion concentration of a solution is $1\times10^{-9}$ $M$ . What is the $pOH$ of the solution?

$pOH = log_{10}[OH^-]$
$pOH = -log_{10}[H^+]$
$pOH = -log_{10}[OH^-]$

$pOH = -log_{10}[1\times10^{-9}]$

$pOH = -(log_{10}\times1.0 + log_{10}\times10^{-9})$
$pOH = -(log_{10}\times1.0 - log_{10}\times10^{-9})$

$pOH = -(2 - 9\,log_{10}\,10)$
$pOH = -(0 - 9\,log_{10}\,10)$
$pOH = -(1 - 9\,log_{10}\,10)$

$pOH = -(0 - 9+2)$
$pOH = -(0 - 9+1)$
$pOH = -(0 - 9)$

$pOH = 11$
$pOH = 10$
$pOH = 9$

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