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(1)em viet phuong trinh dien ly nhe NaOH > Na(+) + OH(-) 0.125 0.375 0.125 KOH > K(+) + OH(-) 0.375 0.375 0.375 so mol OH(-) co dung dich la 0.125+0.375=0.5 mol dat T= so mol OH(-)/ so mol H3PO4 =0.5/0.2=2.5 nen se xay phan ung sau: 2OH(-) + H3PO4 -> HPO4(2-) + 2H2O 2X X X 3OH(-) + H3PO4 -> PO4(3-) + 3H2O 3Y Y Y TA CO HE PHUONG TRINH : 2X+3Y=0.5, X+Y =0.2 ->X= Y=0.1(MOL) KHI CO CAN DUNG DICH KHOI LUONG MUOI BANG TONG KHOI LUONG CAC ION CO TRONG DUNG DICH NEN TA CO KHOI LUONG MUOI NHU SAU: m= m(Na+) +m (k+) +m(HPO4(2-))+ m (PO4(3-))=23.0.125 +39.0.375 +96.0.1 +95.0.1=36.6 (GAM) THẦY GIÀU _GIA SƯ LUYỆN THI ĐẠI HỌC (2)