Chemistry-Please help

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The question is: the arsenate ion has the formula AsO4^3-. Write the formula of the corresponding acid that contains this anion. I don't really understand what I need to do. please help!

  • Chemistry-Please help -

    You're supposed to write the acid. For example, the acid of Cl^- is HCl. The acid of SO4^2- is H2SO4.
    Therefore, the acid for AsO4^3- is H3AsO4.

  • Chemistry-Please help -

    Thank you for your help.

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