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Question

Which one of the following statements is not true?
Given: log 11=1.0414

A
pH+pOH=14 for all aqueous solutions
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B
The pH of 1×108M HCl is 8
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C
The conjugate base of H2PO4 is HPO24
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D
All of the above.
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Solution

The correct option is B The pH of 1×108M HCl is 8
a) pH+pOH=14 for all aqueous solutions at 25oC
b) pH of an acidic solution should be less than 7. The reason is that from H2O, [H+]=107M cannot be neglected in comparison to 108M.
The pH can be calculated as:
from acid, [H+]=108M.
from H2O,[H+]=107M
Total [H+]=108+107
Total [H+]=108(1+10)
Total [H+]=11×108
pH=log[H+]=log(11×108)
pH=[log11+8 log 10]
pH=[1.04148]
pH=6.9586
c) The conjugate base of H2PO4 is HPO24.

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