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3KOH+H3PO4-->K3PO4 + 3H2O
3 mole - 1 mol
0,1 mol - x
x = 0,03 mola - należy dodać tyle H3PO4
0,2 mola - 1000 cm3
0,03mola - x
x = 150cm3
Odp. Potrzeba 150 cm3 roztworu.