Question

11) a. On mixing two liquids the resulting solution gets warm. Explain what type of deviation from ideality is expected in this solution ? what type of azeotrope is likely to be formed?
b. Why are soft drinks bottles sealed at high pressure?

Answer 1

Dear Student,
a) An ideal solution is the one which obeys Raoult's law and for which
$$\begin{gathered} ∆H_{mix}=0 \\ ∆V_{mix}=0 \end{gathered}$$
That means neither heat should be evolved nor absorbed and there should be no expansion or contraction on mixing the solutions.
In the case mentioned in the question heat is evolved that means its an exothermic reaction $∆H=-ve$
$∆H_{mix}<0$ this mixture shows a negative deviation and observed boiling point is higher than expected.
Such a mixture forms a minimum vapour pressure and maximum boiling azeotrope because escaping tendencies of both is lowered than that of ideal
b) soft drinks are sealed at high pressure to enhance the solubility of carbon dioxide in the drink because according to henry's law more the pressure of gas more will be solubility in aqueous phase
Regards!