Question

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

• A. ${\Delta }_{mix}H=0,{\Delta }_{mix}V=0,P_{Total}=p_A^o{x}_A+p_B^o{x}_B$
• B. ${\Delta }_{mix}H=+ve,{\Delta }_{mix}V=0,P_{Total}=p_A^o{x}_A+p_B^o{x}_B$
• C. ${\Delta }_{mix}H=0,{\Delta }_{mix}V=+ve,P_{Total}=p_A^o{x}_A+p_B^o{x}_B$
• D. ${\Delta }_{mix}H=0,{\Delta }_{mix}V=0,P_{Total}=p_B^o{x}_B$

Answer 1

The correct option is A ${\Delta }_{mix}H=0,{\Delta }_{mix}V=0,P_{Total}=p_A^o{x}_A+p_B^o{x}_B$

For an ideal solution that obeys Raoult's Law the following are valid:

1. Heat is neither released nor absorbed during the reaction, ${\Delta }_{mix}H=0$
2. The volume of the solution remains the same ${\Delta }_{mix}V=0$
3. For an ideal solution, $\Delta H$ and$\Delta V$ for mixing should be zero.
4. $P_{Total}=p_A+p_B$ and A-A, B-B and A-B interactions should be nearly the same.