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n Mg=m/M=1,2/24=0,05mol
1mol 2mol
Mg + 2HCl--->MgCl₂+H₂
0,05mol x
x=2*0,05/1=0,1mol
nHCl=0,2mol-0,1mol=0,1mol
C=0,1/0,5=0,2mol/dm³
[H⁺]=0,2mol/dm³
pH=-log0,2=0,7