A 25.3 mL sample of a H3PO4 (triprotic) solution is titrated with a 0.405 M NaOH solution. The equivalence point is reached when 47.7 mL of NaOH solution is added. What is the concentration of the H3PO4 solution?

500bc indiais the answer.

Must be negative.substance increases

Ci hope  it  you

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