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H3PO4 + 3NaOH -----> Na3PO4 + 3H2O
n.NaOH = g/Mr
= 20/40
= 0,5 mol
n.H3PO4 yang dibutuhkan = 1/3 x 1/2
= 1/6 mol
Masa H3PO4 = n x Mr
= 1/6 x 98
= 16,3 gram