The reaction is:

**3 Ag ^{+}_{(aq)} + AsO_{4}^{–}_{(aq)} → Ag_{3}AsO_{4(s)} **

The arsenic in a 1.26 g sample of a pesticide was converted to AsO_{4}^{3-} by suitable chemical treatment. It was then titrated using Ag^{+} to form Ag_{3}AsO_{4} as a precipitate.

If it took 23.0 mL of 0.106 M Ag^{+} to reach the equivalence point in this titration, what is the mass percentage of arsenic in the pesticide?

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