Answer on Question #83609
How much water must be vaporized from 0.4 molar 200mL H2SO4 solution to make it 1.6 molar at same temperature?
Find n(H2SO4) in the first solution: n= c*V = 0.4 mol/L *0.2 L = 0.08 mol
In the second solution n(H2SO4) is the sane as in the first one, n(H2SO4) = 0.08 mol, but the volume of the solution desreases as water vaporizes: V(solution ) = 0.2 L - V(H2O).
In the second solution concentartion of H2SO4 is:
1.6 = 0.08 /(0.2 - V(H2O))
0.05 = 0.2 - V(H2O)
V(H2O) = 0.15 L =150 mL
Answer: 150 mL