Chemistry

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I don't understand how to work out the volumes of weak acid and strong base to mix to make 1L of buffer when given the concentrations of weak acid and strong base (in my case 0.160M NaOH and 0.200M H3PO4) and the pH required (7.00).

Specifically the textbook is Fundamentals of Analytical chem by skoog. west, holler, and crouch, and the question is 15-21.
Thanks

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