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Question

When the pH changes from $$4$$ to $$2$$, the hydrogen ion concentration will increase by a factor:


A
2
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B
1/2
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C
102
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D
100.5
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Solution

The correct option is C $${ 10 }^{ 2 }$$
Formula:
$$pH=-log[H^+]$$
when $$pH=4$$
$$[H^+]=10^{-pH}=10^{-4}$$
when $$pH=2$$
$$[H^+]=10^{-pH}=10^{-2}$$

Increase in hydrogen ion concentration is $$10^{-4}/10^{-2}=100$$

Chemistry

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