J.R. S. answered 04/03/18
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Ph.D. in Biochemistry--University Professor--Chemistry Tutor
Balanced equation:
3NaOH + H3PO4 ==> Na3PO4 + 3H2O
moles NaOH = 0.15 L x 1.00 mol/L = 0.150 moles
moles H3PO4 = 2.80 g x 1 mol/97.99 g = 0.0286 mol
1. [Na] = 0.150 mol/0.150L = 1.00 M
2. [PO4] = 0.0286 mol/0.150L = 0.191 M
3. [OH] = 0.15 mol - (3x0.0286 mol)=0.0642 mol
0.0642 mol/0.15L = 0.428 M