Question

What are the conditions for an ideal solution which obeys Raoult’s law over the entire range of concentration?

• A. $\Delta_{mix}H = 0$, $\Delta _{mix}V = 0$, $P_{Total} =p^{\circ}_{A}x_{A}+ p^{\circ}_{B}x_{B}$
• B. $\Delta_{mix}H = +ve$, $\Delta _{mix}V = 0$, $P_{Total} =p^{\circ}_{A}x_{A}+ p^{\circ}_{B}x_{B}$
• C. $\Delta_{mix}H = 0$, $\Delta _{mix}V = +ve$, $P_{Total} =p^{\circ}_{A}x_{A}+ p^{\circ}_{B}x_{B}$
• D. $\Delta_{mix}H = 0$, $\Delta _{mix}V = 0$, $P_{Total} = p^{\circ}_{B}x_{B}$

Answer 1

Answer: (A)

For an ideal solution $\Delta H$ and $\Delta V$ for mixing should be zero. $P_{Total} = p_A + p_B$ and $A - A$, $B - B$ and $A -B$ interactions are nearly same.