Answer to Question #127094 in General Chemistry for Andani Mutavhatsindi

Question

What is the vapour pressure of saturated solution of ba(oh)2 in atm? The vapour pressure of pure water at 25 degree celsius is 23.8 mmHg

Answer 1

let us assume the conditions to be 1atm and temperature of 25^oC

and P (solution) =X (solvent) + P (solvent)

Barium hydroxide is completely soluble. also, it lacks vapor pressure itself 4.68 g/100 mL (25 °C). Barium hdroxide is formed when barium oxide is dissolved in water. molar mass of BaO = 153.326 g/mole

pressure of solution (Ps) = (100g / 18g/mole) /((100/18) + (4.68g/153.326g/mole))

Hence, vapour pressure of solution (Ps) = 0.99 x 23.8mm of Hg

= 23.63 mm of Hg at 25^oC