Cm=n/Vs sau Cm=md/M*Vs
Cm - concentratia molara, mol/L
n(miu) - nr moli
md - masa substantei dizolvate, g
M - masa moleculara, g/mol
Vs - volumul solutiei, L
Cm=n/Vs==>n=Cm*Vs=0.2*0.3=0.06 moli HCl
1mol............2mol
Mg(OH)2 + 2HCl --> MgCl2 + 2H2O
x=0.03mol...0.06mol
Cm=n/Vs==>Vs=n/Cm=0.03/0.5=0.06L=60cm³