G:
...Na+H2O->NaOH+1/2H2(1)
...0,01..............0,01......................(mol)
NaOH+HCl->NaCl+H2O(2)
0,01.....0,01..........................(mol)
n(HCl)=0,05.0,2=0,01(mol)
Theo PTHH(1);(2):m(Na)=0,01.23=0,23(g)
=>%Na(hợp kim)=0,23:1.100%=23%
G:
Gọi 2x là số mol Al pư
2Al+3CuSO4->Al2(SO4)3+3Cu...