Pressure of

Pressure of . H S, a toxic gas with rotten egg like smell, is used for the qualitative analysis. If the solubility of H S in water at STP is . m, calculate Henry’s law constant. . Henry’s law constant for CO in water is . × Pa at K. Calculate the quantity of CO in mL of soda water when packed under . atm CO pressure at K. . . Vapour Pressure of Liquid- the partial vapour pressure of each component of the solution is directly proportional to its mole fraction present in solution . Thus, for component p µ x and p = p x ( . ) where p is the vapour pressure of pure component at the same temperature. Similarly, for component p = p x ( . ) where p represents the vapour pressure of the pure component . According to Dalton’s law of partial pressures , the total pressure ( total ) over the solution phase in the container will be the sum of the partial pressures of the components of the solution and is given as: p total = p + p ( . ) Substituting the values of p and p , we get p total = x p + x p = ( – x ) p + x p ( . ) = p + ( p – p ) x ( . ) Following conclusions can be drawn from equation ( . ). (i) Total vapour pressure over the solution can be related to the mole fraction of any one component. (ii) Total vapour pressure over the solution varies linearly with the mole fraction of component . (iii) Depending on the vapour pressures of the pure components and , total vapour pressure over the solution decreases or increases with the increase of the mole fraction of component . A plot of p or p