Ca(NO2)2 → Ca(2+) + 2NO2(1-)
Ba(HSO3)2 → Ba(2+) + 2HSO3(1-)
Cr(OH)2Cl → Cr(OH)2(1+) + Cl(1-)
Al2O3+6HCl=2AlCL3+3H2O
+1 -1 +3 -1
Al2O3+6H+6Cl=2Al+6Cl+3H2O
+1 +3
Al2O3+6H=2Al+3H2O
AlCl3+3NaOH=Al(OH)3+3NaCl
+3 -1 +1 -1 +1 -1
Al+3Cl+3Na+3OH=Al(OH)3+3Na+3Cl
+3 -1
Al+3OH=Al(OH)3
PH= -lg[H+]
[H+] = 10^-5
CH3COOH ⇄ CH3COO- + H+
α= [H+]/C = 10^-5/0,01= 0,001
0,001*100%= 0,1%
M примесей = 0,2*140=28 г
<span>m Al = 140-28=112 г
</span>
112 г х г
4Al + 3O2 = 2Al2O3
n(Al) = m/M = 112/27=4,1 моль
n(Al2O3) = 0,5 * n(Al) = 0.5 * 4.1 = 2.05 моль
m(Al2O3)= n(Al2O3) * <span>M(Al2O3) = 2.05 * 102 = 209.1г</span>