\(n_{HCl\left(0,2M\right)}=0,25.0,2=0,05\left(mol\right)\)
\(n_{HCl}\left(0,4M\right)=0,35.0,4=0,14\left(MOL\right)\)
\(C_{M\left(ddthudc\right)}=\dfrac{0,05+0,14}{0,25+0,35}=0,31667\left(M\right)\)
Ta có nHCl 0,2M=0,2.0,25=0,05(mol)
nHCl 0,4M=0,4.0,35=0,14(mol)
=>C\(_M\)HCl=\(\dfrac{0,05+0,14}{0,25+0,35}\)=0,32M