An aqueous solution contains 12% ( w / w ) MgSO 4 and 9.5% ( w / w ) MgCl 2 . If the sulphate dissociates up to 80% and chloride dissociates up to 60% , the elevation in boiling point (in Kelvin)

Question

An aqueous solution contains 12% ( w / w ) MgSO 4 ​ and 9.5% ( w / w ) MgCl 2 ​ . If the sulphate dissociates up to 80% and chloride dissociates up to 60% , the elevation in boiling point (in Kelvin) is ____ ( K b ​ of water = 0.785 K = kg/mol) (Atomic mass: Mg – 24 g/mol, Cl - 35.5 g/mol, S - 32 g/mol, O - 16 g/mol)

TestHub · Accepted Answer

X = molarity of MgSO 4 ​ = 100 12 ​ × M MgSO 4 ​ ​ 1000 ​ Y = molarity of MgCl 2 ​ = 100 9.5 ​ × M MgCl 2 ​ ​ 1000 ​ Total molarity of ions = 1.8 x + 2.2 y delta T b ​ = K d ​ ( 1.8 x + 2.2 y )

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