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

20. Intext Example I

Exercise condition:

6 m.

Calculate the $pH$ of $0.01$ $M$ $HNO_3$ .

$[H^+] = 0.01$

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

$pH = -log_{10}$

$[0.01]$

$pH = -log_{10}$ $[1\times10^{-1}]$
$pH = -log_{10}$ $[1\times10^{-3}]$
$pH = -log_{10}$ $[1\times10^{-2}]$

$pH = -(log_{10}1 - 1\, log_{10}10)$
$pH = -(log_{10}1 - 2\, log_{10}10)$
$pH = -(log_{10}1 - 3\, log_{10}10)$

$pH = 0 + 2\times\,log_{10}\,10$
$pH = 1 + 2\times\,log_{10}\,10$
$pH = 2 + 2\times\,log_{10}\,10$

$pH = 1 + 2\times1 = 3$
$pH = 0 + 2\times1 = 2$
$pH = 2 + 2\times1 = 4$

Hence,

$pH = 2$
$pH = 4$
$pH = 3$

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