What is the concentration of the unknown H3PO4 solution? The neutralization reaction is H3PO4(aq)+3NaOH(aq)→3H2O(l)+Na3PO4(aq)

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Answer 1 · 2017-06-12T18:38:23

For a start your reaction is.........

#H_3PO_4(aq) + 2NaOH(aq) rarr Na_2HPO_4(aq) + 2H_2O#

Phosphoric acid is a DIACID in aqueous solution; and you should point this out to your prof.

And thus #"moles of NaOH"=26.28xx10^-3Lxx0.100*mol*L^-1#

#-=2.63xx10^-3*mol#

And thus #"concentration "H_3PO_4=(2.63xx10^-3*molxx1/2)/(32.00xx10^-3L)#

#=4.11xx10^-2*mol*L^-1.#

#"I reiterate that phosphoric acid is a diacid and not a triacid."#