The following is the reaction showing the complete neutralization of calcium hydroxide (a base) with phosphoric acid: 3Ca(OH)2​(aq) + 2H3​PO4​(aq) →

The following is the reaction showing the complete neutralization of calcium hydroxide (a base) with phosphoric acid:
3Ca(OH)2​(aq) + 2H3​PO4​(aq) → Ca3​(PO4​)2​(s) + 6H2​O(ℓ)
A stock solution of calcium hydroxide (base) is made by dissolving 3.51 grams of it into some water and the volume is brought to 750 mL. A 50.0 mL portion of that stock solution is then titrated with a solution of 0.229 M phosphoric acid. How many milliliters (mL) of the acid are needed to completely neutralize the base in this reaction? (tolerance is ±0.1 mL)

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