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Mooned
2 năm trước
trộn 50ml dd HCl 0,2M với 50ml dd H2SO4 0,3M thu dc dd X tính pH dd X dd Y chứa đồng thời KOH và Ba(OH)2 có pH=12,9031 thêm V (L) dd Y vào dd X thu dc dd có pH=1,6989 Tính V
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