MISSED THIS? Watch IWE: Acid-Base Titration; Read Section 5.7. You can click on the Review link to access the section in your eText. A 35.00mL sample of an unknown H3PO4 solution is titrated with a 0.150MNOH solution. The equivalence point is reached when 27.76mL of NaOH solution is added. Part A The neutralization reaction is H3PO4(aq)+3NaOH(aq)3H2O(l)+Na3PO4(aq) What is the concentration of the unknown H3PO4 solution? Express the molarity to three significant figures