titration Q TT

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jihyunjun12

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how do yo usolve this? this is topscore pro test 2 chem Q68.

i don't understahnd the explanation at all.
the Q is:
what volume of hcl was added if 20ml of 1M naoh is titrated with 1 M hcl to produce ph = 2?

the answer is 20.4 but id on't get it. HELP🙁
 
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