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A 25.0 mL sample of phosphoric acid (H3PO4) solution is exactly…
Question
A 25.0 mL sample of phosphoric acid (H3PO4) solution is exactly neutralized (all three acidic hydrogens) by 30.0 mL of 0.200 M sodium hydroxide. The reaction is H3PO4 + 3NaOH -> Na3PO4 + 3H2O. Calculate the molarity of the phosphoric acid solution.
✓ Verified answer: 0.08checked by our engine — not a guess
Step-by-step solution
Moles NaOH = 0.0300 L x 0.200 M = 0.00600 mol.
From the 1:3 stoichiometry, moles H3PO4 = 0.00600/3 = 0.00200 mol.
Molarity = 0.00200/0.0250 = 0.0800 M.
Final answer0.08
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