When a nonvolatilesolute is added to a volatile solvent, the solution vapor pres

Question

When a nonvolatilesolute is added to a volatile solvent, the solution vapor pressure__________, the boiling point __________, the freezing point__________, and the osmotic pressure across a semipermeablemembrane __________ decreases,increases,decreases, decreases increases, increases,decreases, increases increases, decreases,increases, decreases decreases, decreases,increases, decreases decreases, increases,decreases, increases When a nonvolatilesolute is added to a volatile solvent, the solution vapor pressure__________, the boiling point __________, the freezing point__________, and the osmotic pressure across a semipermeablemembrane __________ decreases,increases,decreases, decreases increases, increases,decreases, increases increases, decreases,increases, decreases decreases, decreases,increases, decreases decreases, increases,decreases, increases

Explanation / Answer

a ) Upon adding a non volatile solute to the volatile solventfollowing are the changes in the colligative properties.     Vapour pressure   --Decreases      boilingpoint        -- Increases      Freezingpoint      -- Decreases Osmotic pressure      --Decreases Answer is option a. b) Formula :                    = MRT Where is the osmotic pressure            M is the molarity            R is the gas constant            T is the temperature Data :           M   = 0.025 g / 340 g / mol * 0.350 L                  =2.1 * 10 ^ -4 M            R   = 0.0821 L .atm / mol.K             T   = 273 + 20 K                  = 293 K Upon substituting in the above formula,               =  2.1 * 10 ^ -4 M * 0.0821 L .atm / mol.K *  293 K                 = 0.005 atm                 = 3.8 torr

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