CHO m gam A vao H2O co pu ;
\(BA+2H_2O\rightarrow BA(OH)_2+H_2\uparrow\)
mol x \(\rightarrow\) x x
\(2Al+BA(OH)_2+H_2O\rightarrow BA(AlO_2)_2+3H_2\)
mol y \(\rightarrow\) 1,5y
ta co :x+1,5y =0,4 mol(I)
CHO m gam A vao NAOH du
\(BA+2H_2O\rightarrow BA(OH)_2+H_2\)
mol x \(\rightarrow\) x
\(2Al+2NAOH+2H_2O\rightarrow2NA(AlO_2)_2+3H_2\)
mol x \(\rightarrow\) 1,5y
ta co x+1,5y =0.55mol(II)
so sanh (I) va (II) thay o phan I Al du
Tinh duoc x=0,1 mol \(\rightarrow n_{BA}=0,1mol\)
y=0,3 mol \(\rightarrow n_{Al}=0,3mol\)
CHO m gam A vao dung dich HCl du
\(BA+2HCl\rightarrow BACL_2+H_2\)
\(Mg+2HCl\rightarrow MgCl_2H_2\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
Tinh duoc \(n_{Mg}=0,05mol\)
vay m=23
%BA =58.56
%Al =35,21
%Mg=5,23