another gchem question

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nickatina

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# 68 topscore test 2

what volume of HCl was added if 20 mL of 1M NaOH is titrated with 1M HCl to produce a pH=2?

10.2
20.2
30.4
35.5
none of the above

answer is e none of the above. how would you set this problem up?
i was thinking henderson hasselbalch eq but got stuck setting it up....
 
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