H3PO4+3NaOH=Na3PO4+3H2O
m(NaOH)=ω1(NaOH)⋅m1(р-ра)/100=8⋅30/100=2.4г
n(NaOH)=m(NaOH)/M(NaOH)=2.4/40=0.06 n(H3PO4)=n(Na3PO4)=n(NaOH)/3=0.06/3=0.02 моль
m(Na3PO4)=n(Na3PO4)⋅M(Na3PO4)=0.02⋅164=3.28г
m(H3PO4)=n(H3PO4)⋅M(H3PO4)=0.02⋅98=1.96г
m2(р-ра)=100⋅m(H3PO4)/ω2(H3PO4)=100⋅1.96/2=98г
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Verified answer
H3PO4+3NaOH=Na3PO4+3H2O
m(NaOH)=ω1(NaOH)⋅m1(р-ра)/100=8⋅30/100=2.4г
n(NaOH)=m(NaOH)/M(NaOH)=2.4/40=0.06 n(H3PO4)=n(Na3PO4)=n(NaOH)/3=0.06/3=0.02 моль
m(Na3PO4)=n(Na3PO4)⋅M(Na3PO4)=0.02⋅164=3.28г
m(H3PO4)=n(H3PO4)⋅M(H3PO4)=0.02⋅98=1.96г
m2(р-ра)=100⋅m(H3PO4)/ω2(H3PO4)=100⋅1.96/2=98г