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REPEATER 2024 — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryREPEATER 20243 Marks
Question
State Henry's Law.
Write four conditions for ideal solutions.
✓

Answer

Henry's law :
Henry's law: It states that the solubility of a gas in a liquid is directly proportional to the pressure of the gas over the solution. Thus,
$S \propto P \ \text { or } \quad S=K_H P$
Where, $S$ is the solubility of the gas, $P$ is the pressure of the gas over the solution. $K_H$, the proportionality constant is called Henry's law constant
Conditions for ideal solutions:
(1) Ideal solutions obey Raoult's law over entire range of concentrations.
(2) No heat is evolved or absorbed when two components forming an ideal solution are mixed. Thus, the enthalpy of mixing is zero. $\Delta_{\text {mix }} H=0$.
(3) There is no volume change when two components forming an ideal solution are mixed. Thus volume of an ideal solution is equal to the sum of volumes of two components taken for mixing. $\Delta_{m i x} V=0$.
(4) In an ideal solution solvent-solute, solutesolute and solvent-solvent molecular interactions are comparable.
(5) The vapour pressure of ideal solution always lies between vapour pressures of pure components.

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