Recall that at the equivalence point of a titration:
Also, recall that moles = molarity × volume.
Correct the concentration depending on the number of acidic or basic ions present:
For acids: Multiply by the number of H+ ions
For bases: Multiply by the number of OH–, H–, O2–, or NH2– ions
Solving for Macid:
A 31.00 mL sample of an unknown H3PO4 solution is titrated with a 0.120 M NaOH solution. The equivalence point is reached when 26.43 mL of NaOH solution is added. What is the concentration of the unknown H3PO4 solution? The neutralization reaction is H3PO4 (aq) + 3 NaOH(aq) → 3 H2O(l) + Na3PO4(aq)
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Equivalence Point concept. If you need more Equivalence Point practice, you can also practice Equivalence Point practice problems.