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H3PO4 + 3NaOH -->Na3PO4+3H20
98g ------3*40g
12g ------x
-------------------
x=14,69g
mH3PO4=98u
mNaOH=40u
H3PO4 + 3NaOH---->Na3PO4 + 3H2O
98g kwasu-------3*40g NaOH
12g kwasu---------xg NaOH
x=14,7g kwasu
12g h3po4=x
98-120
x=14,7