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What is the pKa of a weak acid called dihydrogen arsenate H2AsO4-1 if a 0.001M aqueous...

What is the pKa of a weak acid called dihydrogen arsenate H2AsO4-1 if a 0.001M aqueous solution has a pH of 5?

This is for my BioChem class, the answer is supposed to be 7, can someone please very distinctly write out the steps? Also, I'm not allowed a calculator so please tell me how you know what the number would be when converting logs and exponents. Thank you!

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