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Question

moles of HCl should be added to 1 L aqueous solution of HCl of pH=3, in order to decrease its pH to 2.

A
0.009
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B
1
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C
0.001
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Solution

The correct option is A 0.009
Mole of HCl of pH=3 in 1 L is 0.001
Mole of HCl of pH=2 in 1 L is 0.01

Therefore, mole of HCl to be added in HCl of pH=3 is
= 0.01-0.001
= 0.009 mole

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