Answer :
The concentration of an H₃PO₄ solution if 25.00 ml is converted to Na₂HPO₄ by 39.13 ml of 2.000 m NaOH solution is 3.12 M.
given that :
Concentration M1 = 2.00 M
volume V1 = 39.13 mL
Volume V2 = 25 mL
Concentration M2 = ?
concentration = moles / volume in L
moles = concentration × volume in L
moles = 2 × 0.03913
moles = 0.0782 mol
Concentration of H₃PO₄ = moles / volume in L
Concentration of H₃PO = 0.0782 / 0.025
Concentration of H₃PO₄ = 3.12 M
Thus, the concentration of an H₃PO₄ solution is 3.12 M
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